Precalculus Examples

$y = {(x - 3)}^{2} + 9$ , ${(x - 3)}^{2} + {(y - 9)}^{2} = 30$

Step 1

Simplify ${(x - 3)}^{2} + 9$ .

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Step 1.1

Simplify each term.

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Step 1.1.1

Rewrite ${(x - 3)}^{2}$ as $(x - 3) (x - 3)$ .

$y = (x - 3) (x - 3) + 9$

${(x - 3)}^{2} + {(y - 9)}^{2} = 30$

Step 1.1.2

Expand $(x - 3) (x - 3)$ using the FOIL Method.

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Step 1.1.2.1

Apply the distributive property.

$y = x (x - 3) - 3 (x - 3) + 9$

${(x - 3)}^{2} + {(y - 9)}^{2} = 30$

Step 1.1.2.2

Apply the distributive property.

$y = x \cdot x + x \cdot - 3 - 3 (x - 3) + 9$

${(x - 3)}^{2} + {(y - 9)}^{2} = 30$

Step 1.1.2.3

Apply the distributive property.

$y = x \cdot x + x \cdot - 3 - 3 x - 3 \cdot - 3 + 9$

${(x - 3)}^{2} + {(y - 9)}^{2} = 30$

$y = x \cdot x + x \cdot - 3 - 3 x - 3 \cdot - 3 + 9$

${(x - 3)}^{2} + {(y - 9)}^{2} = 30$

Step 1.1.3

Simplify and combine like terms.

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Step 1.1.3.1

Simplify each term.

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Step 1.1.3.1.1

Multiply $x$ by $x$ .

$y = x^{2} + x \cdot - 3 - 3 x - 3 \cdot - 3 + 9$

${(x - 3)}^{2} + {(y - 9)}^{2} = 30$

Step 1.1.3.1.2

Move $- 3$ to the left of $x$ .

$y = x^{2} - 3 \cdot x - 3 x - 3 \cdot - 3 + 9$

${(x - 3)}^{2} + {(y - 9)}^{2} = 30$

Step 1.1.3.1.3

Multiply $- 3$ by $- 3$ .

$y = x^{2} - 3 x - 3 x + 9 + 9$

${(x - 3)}^{2} + {(y - 9)}^{2} = 30$

$y = x^{2} - 3 x - 3 x + 9 + 9$

${(x - 3)}^{2} + {(y - 9)}^{2} = 30$

Step 1.1.3.2

Subtract $3 x$ from $- 3 x$ .

$y = x^{2} - 6 x + 9 + 9$

${(x - 3)}^{2} + {(y - 9)}^{2} = 30$

$y = x^{2} - 6 x + 9 + 9$

${(x - 3)}^{2} + {(y - 9)}^{2} = 30$

$y = x^{2} - 6 x + 9 + 9$

${(x - 3)}^{2} + {(y - 9)}^{2} = 30$

Step 1.2

Add $9$ and $9$ .

$y = x^{2} - 6 x + 18$

${(x - 3)}^{2} + {(y - 9)}^{2} = 30$

$y = x^{2} - 6 x + 18$

${(x - 3)}^{2} + {(y - 9)}^{2} = 30$

Step 2

Replace all occurrences of $y$ with $x^{2} - 6 x + 18$ in each equation.

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Step 2.1

Replace all occurrences of $y$ in ${(x - 3)}^{2} + {(y - 9)}^{2} = 30$ with $x^{2} - 6 x + 18$ .

${(x - 3)}^{2} + {((x^{2} - 6 x + 18) - 9)}^{2} = 30$

$y = x^{2} - 6 x + 18$

Step 2.2

Simplify the left side.

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Step 2.2.1

Simplify ${(x - 3)}^{2} + {((x^{2} - 6 x + 18) - 9)}^{2}$ .

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Step 2.2.1.1

Simplify each term.

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Step 2.2.1.1.1

Rewrite ${(x - 3)}^{2}$ as $(x - 3) (x - 3)$ .

$(x - 3) (x - 3) + {((x^{2} - 6 x + 18) - 9)}^{2} = 30$

$y = x^{2} - 6 x + 18$

Step 2.2.1.1.2

Expand $(x - 3) (x - 3)$ using the FOIL Method.

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Step 2.2.1.1.2.1

Apply the distributive property.

$x (x - 3) - 3 (x - 3) + {((x^{2} - 6 x + 18) - 9)}^{2} = 30$

$y = x^{2} - 6 x + 18$

Step 2.2.1.1.2.2

Apply the distributive property.

$x \cdot x + x \cdot - 3 - 3 (x - 3) + {((x^{2} - 6 x + 18) - 9)}^{2} = 30$

$y = x^{2} - 6 x + 18$

Step 2.2.1.1.2.3

Apply the distributive property.

$x \cdot x + x \cdot - 3 - 3 x - 3 \cdot - 3 + {((x^{2} - 6 x + 18) - 9)}^{2} = 30$

$y = x^{2} - 6 x + 18$

$x \cdot x + x \cdot - 3 - 3 x - 3 \cdot - 3 + {((x^{2} - 6 x + 18) - 9)}^{2} = 30$

$y = x^{2} - 6 x + 18$

Step 2.2.1.1.3

Simplify and combine like terms.

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Step 2.2.1.1.3.1

Simplify each term.

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Step 2.2.1.1.3.1.1

Multiply $x$ by $x$ .

$x^{2} + x \cdot - 3 - 3 x - 3 \cdot - 3 + {((x^{2} - 6 x + 18) - 9)}^{2} = 30$

$y = x^{2} - 6 x + 18$

Step 2.2.1.1.3.1.2

Move $- 3$ to the left of $x$ .

$x^{2} - 3 \cdot x - 3 x - 3 \cdot - 3 + {((x^{2} - 6 x + 18) - 9)}^{2} = 30$

$y = x^{2} - 6 x + 18$

Step 2.2.1.1.3.1.3

Multiply $- 3$ by $- 3$ .

$x^{2} - 3 x - 3 x + 9 + {((x^{2} - 6 x + 18) - 9)}^{2} = 30$

$y = x^{2} - 6 x + 18$

$x^{2} - 3 x - 3 x + 9 + {((x^{2} - 6 x + 18) - 9)}^{2} = 30$

$y = x^{2} - 6 x + 18$

Step 2.2.1.1.3.2

Subtract $3 x$ from $- 3 x$ .

$x^{2} - 6 x + 9 + {((x^{2} - 6 x + 18) - 9)}^{2} = 30$

$y = x^{2} - 6 x + 18$

$x^{2} - 6 x + 9 + {((x^{2} - 6 x + 18) - 9)}^{2} = 30$

$y = x^{2} - 6 x + 18$

Step 2.2.1.1.4

Subtract $9$ from $18$ .

$x^{2} - 6 x + 9 + {(x^{2} - 6 x + 9)}^{2} = 30$

$y = x^{2} - 6 x + 18$

Step 2.2.1.1.5

Rewrite ${(x^{2} - 6 x + 9)}^{2}$ as $(x^{2} - 6 x + 9) (x^{2} - 6 x + 9)$ .

$x^{2} - 6 x + 9 + (x^{2} - 6 x + 9) (x^{2} - 6 x + 9) = 30$

$y = x^{2} - 6 x + 18$

Step 2.2.1.1.6

Expand $(x^{2} - 6 x + 9) (x^{2} - 6 x + 9)$ by multiplying each term in the first expression by each term in the second expression.

$x^{2} - 6 x + 9 + x^{2} x^{2} + x^{2} (- 6 x) + x^{2} \cdot 9 - 6 x \cdot x^{2} - 6 x (- 6 x) - 6 x \cdot 9 + 9 x^{2} + 9 (- 6 x) + 9 \cdot 9 = 30$

$y = x^{2} - 6 x + 18$

Step 2.2.1.1.7

Simplify each term.

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Step 2.2.1.1.7.1

Multiply $x^{2}$ by $x^{2}$ by adding the exponents.

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Step 2.2.1.1.7.1.1

Use the power rule $a^{m} a^{n} = a^{m + n}$ to combine exponents.

$x^{2} - 6 x + 9 + x^{2 + 2} + x^{2} (- 6 x) + x^{2} \cdot 9 - 6 x \cdot x^{2} - 6 x (- 6 x) - 6 x \cdot 9 + 9 x^{2} + 9 (- 6 x) + 9 \cdot 9 = 30$

$y = x^{2} - 6 x + 18$

Step 2.2.1.1.7.1.2

Add $2$ and $2$ .

$x^{2} - 6 x + 9 + x^{4} + x^{2} (- 6 x) + x^{2} \cdot 9 - 6 x \cdot x^{2} - 6 x (- 6 x) - 6 x \cdot 9 + 9 x^{2} + 9 (- 6 x) + 9 \cdot 9 = 30$

$y = x^{2} - 6 x + 18$

$x^{2} - 6 x + 9 + x^{4} + x^{2} (- 6 x) + x^{2} \cdot 9 - 6 x \cdot x^{2} - 6 x (- 6 x) - 6 x \cdot 9 + 9 x^{2} + 9 (- 6 x) + 9 \cdot 9 = 30$

$y = x^{2} - 6 x + 18$

Step 2.2.1.1.7.2

Rewrite using the commutative property of multiplication.

$x^{2} - 6 x + 9 + x^{4} - 6 x^{2} x + x^{2} \cdot 9 - 6 x \cdot x^{2} - 6 x (- 6 x) - 6 x \cdot 9 + 9 x^{2} + 9 (- 6 x) + 9 \cdot 9 = 30$

$y = x^{2} - 6 x + 18$

Step 2.2.1.1.7.3

Multiply $x^{2}$ by $x$ by adding the exponents.

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Step 2.2.1.1.7.3.1

Move $x$ .

$x^{2} - 6 x + 9 + x^{4} - 6 (x \cdot x^{2}) + x^{2} \cdot 9 - 6 x \cdot x^{2} - 6 x (- 6 x) - 6 x \cdot 9 + 9 x^{2} + 9 (- 6 x) + 9 \cdot 9 = 30$

$y = x^{2} - 6 x + 18$

Step 2.2.1.1.7.3.2

Multiply $x$ by $x^{2}$ .

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Step 2.2.1.1.7.3.2.1

Raise $x$ to the power of $1$ .

$x^{2} - 6 x + 9 + x^{4} - 6 (x \cdot x^{2}) + x^{2} \cdot 9 - 6 x \cdot x^{2} - 6 x (- 6 x) - 6 x \cdot 9 + 9 x^{2} + 9 (- 6 x) + 9 \cdot 9 = 30$

$y = x^{2} - 6 x + 18$

Step 2.2.1.1.7.3.2.2

Use the power rule $a^{m} a^{n} = a^{m + n}$ to combine exponents.

$x^{2} - 6 x + 9 + x^{4} - 6 x^{1 + 2} + x^{2} \cdot 9 - 6 x \cdot x^{2} - 6 x (- 6 x) - 6 x \cdot 9 + 9 x^{2} + 9 (- 6 x) + 9 \cdot 9 = 30$

$y = x^{2} - 6 x + 18$

$x^{2} - 6 x + 9 + x^{4} - 6 x^{1 + 2} + x^{2} \cdot 9 - 6 x \cdot x^{2} - 6 x (- 6 x) - 6 x \cdot 9 + 9 x^{2} + 9 (- 6 x) + 9 \cdot 9 = 30$

$y = x^{2} - 6 x + 18$

Step 2.2.1.1.7.3.3

Add $1$ and $2$ .

$x^{2} - 6 x + 9 + x^{4} - 6 x^{3} + x^{2} \cdot 9 - 6 x \cdot x^{2} - 6 x (- 6 x) - 6 x \cdot 9 + 9 x^{2} + 9 (- 6 x) + 9 \cdot 9 = 30$

$y = x^{2} - 6 x + 18$

$x^{2} - 6 x + 9 + x^{4} - 6 x^{3} + x^{2} \cdot 9 - 6 x \cdot x^{2} - 6 x (- 6 x) - 6 x \cdot 9 + 9 x^{2} + 9 (- 6 x) + 9 \cdot 9 = 30$

$y = x^{2} - 6 x + 18$

Step 2.2.1.1.7.4

Move $9$ to the left of $x^{2}$ .

$x^{2} - 6 x + 9 + x^{4} - 6 x^{3} + 9 \cdot x^{2} - 6 x \cdot x^{2} - 6 x (- 6 x) - 6 x \cdot 9 + 9 x^{2} + 9 (- 6 x) + 9 \cdot 9 = 30$

$y = x^{2} - 6 x + 18$

Step 2.2.1.1.7.5

Multiply $x$ by $x^{2}$ by adding the exponents.

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Step 2.2.1.1.7.5.1

Move $x^{2}$ .

$x^{2} - 6 x + 9 + x^{4} - 6 x^{3} + 9 x^{2} - 6 (x^{2} x) - 6 x (- 6 x) - 6 x \cdot 9 + 9 x^{2} + 9 (- 6 x) + 9 \cdot 9 = 30$

$y = x^{2} - 6 x + 18$

Step 2.2.1.1.7.5.2

Multiply $x^{2}$ by $x$ .

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Step 2.2.1.1.7.5.2.1

Raise $x$ to the power of $1$ .

$x^{2} - 6 x + 9 + x^{4} - 6 x^{3} + 9 x^{2} - 6 (x^{2} x) - 6 x (- 6 x) - 6 x \cdot 9 + 9 x^{2} + 9 (- 6 x) + 9 \cdot 9 = 30$

$y = x^{2} - 6 x + 18$

Step 2.2.1.1.7.5.2.2

Use the power rule $a^{m} a^{n} = a^{m + n}$ to combine exponents.

$x^{2} - 6 x + 9 + x^{4} - 6 x^{3} + 9 x^{2} - 6 x^{2 + 1} - 6 x (- 6 x) - 6 x \cdot 9 + 9 x^{2} + 9 (- 6 x) + 9 \cdot 9 = 30$

$y = x^{2} - 6 x + 18$

$x^{2} - 6 x + 9 + x^{4} - 6 x^{3} + 9 x^{2} - 6 x^{2 + 1} - 6 x (- 6 x) - 6 x \cdot 9 + 9 x^{2} + 9 (- 6 x) + 9 \cdot 9 = 30$

$y = x^{2} - 6 x + 18$

Step 2.2.1.1.7.5.3

Add $2$ and $1$ .

$x^{2} - 6 x + 9 + x^{4} - 6 x^{3} + 9 x^{2} - 6 x^{3} - 6 x (- 6 x) - 6 x \cdot 9 + 9 x^{2} + 9 (- 6 x) + 9 \cdot 9 = 30$

$y = x^{2} - 6 x + 18$

$x^{2} - 6 x + 9 + x^{4} - 6 x^{3} + 9 x^{2} - 6 x^{3} - 6 x (- 6 x) - 6 x \cdot 9 + 9 x^{2} + 9 (- 6 x) + 9 \cdot 9 = 30$

$y = x^{2} - 6 x + 18$

Step 2.2.1.1.7.6

Rewrite using the commutative property of multiplication.

$x^{2} - 6 x + 9 + x^{4} - 6 x^{3} + 9 x^{2} - 6 x^{3} - 6 \cdot (- 6 x \cdot x) - 6 x \cdot 9 + 9 x^{2} + 9 (- 6 x) + 9 \cdot 9 = 30$

$y = x^{2} - 6 x + 18$

Step 2.2.1.1.7.7

Multiply $x$ by $x$ by adding the exponents.

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Step 2.2.1.1.7.7.1

Move $x$ .

$x^{2} - 6 x + 9 + x^{4} - 6 x^{3} + 9 x^{2} - 6 x^{3} - 6 \cdot (- 6 (x \cdot x)) - 6 x \cdot 9 + 9 x^{2} + 9 (- 6 x) + 9 \cdot 9 = 30$

$y = x^{2} - 6 x + 18$

Step 2.2.1.1.7.7.2

Multiply $x$ by $x$ .

$x^{2} - 6 x + 9 + x^{4} - 6 x^{3} + 9 x^{2} - 6 x^{3} - 6 \cdot (- 6 x^{2}) - 6 x \cdot 9 + 9 x^{2} + 9 (- 6 x) + 9 \cdot 9 = 30$

$y = x^{2} - 6 x + 18$

$x^{2} - 6 x + 9 + x^{4} - 6 x^{3} + 9 x^{2} - 6 x^{3} - 6 \cdot (- 6 x^{2}) - 6 x \cdot 9 + 9 x^{2} + 9 (- 6 x) + 9 \cdot 9 = 30$

$y = x^{2} - 6 x + 18$

Step 2.2.1.1.7.8

Multiply $- 6$ by $- 6$ .

$x^{2} - 6 x + 9 + x^{4} - 6 x^{3} + 9 x^{2} - 6 x^{3} + 36 x^{2} - 6 x \cdot 9 + 9 x^{2} + 9 (- 6 x) + 9 \cdot 9 = 30$

$y = x^{2} - 6 x + 18$

Step 2.2.1.1.7.9

Multiply $9$ by $- 6$ .

$x^{2} - 6 x + 9 + x^{4} - 6 x^{3} + 9 x^{2} - 6 x^{3} + 36 x^{2} - 54 x + 9 x^{2} + 9 (- 6 x) + 9 \cdot 9 = 30$

$y = x^{2} - 6 x + 18$

Step 2.2.1.1.7.10

Multiply $- 6$ by $9$ .

$x^{2} - 6 x + 9 + x^{4} - 6 x^{3} + 9 x^{2} - 6 x^{3} + 36 x^{2} - 54 x + 9 x^{2} - 54 x + 9 \cdot 9 = 30$

$y = x^{2} - 6 x + 18$

Step 2.2.1.1.7.11

Multiply $9$ by $9$ .

$x^{2} - 6 x + 9 + x^{4} - 6 x^{3} + 9 x^{2} - 6 x^{3} + 36 x^{2} - 54 x + 9 x^{2} - 54 x + 81 = 30$

$y = x^{2} - 6 x + 18$

$x^{2} - 6 x + 9 + x^{4} - 6 x^{3} + 9 x^{2} - 6 x^{3} + 36 x^{2} - 54 x + 9 x^{2} - 54 x + 81 = 30$

$y = x^{2} - 6 x + 18$

Step 2.2.1.1.8

Subtract $6 x^{3}$ from $- 6 x^{3}$ .

$x^{2} - 6 x + 9 + x^{4} - 12 x^{3} + 9 x^{2} + 36 x^{2} - 54 x + 9 x^{2} - 54 x + 81 = 30$

$y = x^{2} - 6 x + 18$

Step 2.2.1.1.9

Add $9 x^{2}$ and $36 x^{2}$ .

$x^{2} - 6 x + 9 + x^{4} - 12 x^{3} + 45 x^{2} - 54 x + 9 x^{2} - 54 x + 81 = 30$

$y = x^{2} - 6 x + 18$

Step 2.2.1.1.10

Add $45 x^{2}$ and $9 x^{2}$ .

$x^{2} - 6 x + 9 + x^{4} - 12 x^{3} + 54 x^{2} - 54 x - 54 x + 81 = 30$

$y = x^{2} - 6 x + 18$

Step 2.2.1.1.11

Subtract $54 x$ from $- 54 x$ .

$x^{2} - 6 x + 9 + x^{4} - 12 x^{3} + 54 x^{2} - 108 x + 81 = 30$

$y = x^{2} - 6 x + 18$

$x^{2} - 6 x + 9 + x^{4} - 12 x^{3} + 54 x^{2} - 108 x + 81 = 30$

$y = x^{2} - 6 x + 18$

Step 2.2.1.2

Simplify by adding terms.

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Step 2.2.1.2.1

Add $x^{2}$ and $54 x^{2}$ .

$55 x^{2} - 6 x + 9 + x^{4} - 12 x^{3} - 108 x + 81 = 30$

$y = x^{2} - 6 x + 18$

Step 2.2.1.2.2

Subtract $108 x$ from $- 6 x$ .

$55 x^{2} + 9 + x^{4} - 12 x^{3} - 114 x + 81 = 30$

$y = x^{2} - 6 x + 18$

Step 2.2.1.2.3

Add $9$ and $81$ .

$55 x^{2} + x^{4} - 12 x^{3} - 114 x + 90 = 30$

$y = x^{2} - 6 x + 18$

$55 x^{2} + x^{4} - 12 x^{3} - 114 x + 90 = 30$

$y = x^{2} - 6 x + 18$

$55 x^{2} + x^{4} - 12 x^{3} - 114 x + 90 = 30$

$y = x^{2} - 6 x + 18$

$55 x^{2} + x^{4} - 12 x^{3} - 114 x + 90 = 30$

$y = x^{2} - 6 x + 18$

$55 x^{2} + x^{4} - 12 x^{3} - 114 x + 90 = 30$

$y = x^{2} - 6 x + 18$

Step 3

Graph each side of the equation. The solution is the x-value of the point of intersection.

$x = 3 - \sqrt{5}, 3 + \sqrt{5}$

$y = x^{2} - 6 x + 18$

Step 4

Replace all occurrences of $x$ with $3 - \sqrt{5}$ in each equation.

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Step 4.1

Replace all occurrences of $x$ in $y = x^{2} - 6 x + 18$ with $3 - \sqrt{5}$ .

$y = {(3 - \sqrt{5})}^{2} - 6 (3 - \sqrt{5}) + 18$

$x = 3 - \sqrt{5}$

Step 4.2

Simplify the right side.

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Step 4.2.1

Simplify ${(3 - \sqrt{5})}^{2} - 6 (3 - \sqrt{5}) + 18$ .

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Step 4.2.1.1

Simplify each term.

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Step 4.2.1.1.1

Rewrite ${(3 - \sqrt{5})}^{2}$ as $(3 - \sqrt{5}) (3 - \sqrt{5})$ .

$y = (3 - \sqrt{5}) (3 - \sqrt{5}) - 6 (3 - \sqrt{5}) + 18$

$x = 3 - \sqrt{5}$

Step 4.2.1.1.2

Expand $(3 - \sqrt{5}) (3 - \sqrt{5})$ using the FOIL Method.

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Step 4.2.1.1.2.1

Apply the distributive property.

$y = 3 (3 - \sqrt{5}) - \sqrt{5} (3 - \sqrt{5}) - 6 (3 - \sqrt{5}) + 18$

$x = 3 - \sqrt{5}$

Step 4.2.1.1.2.2

Apply the distributive property.

$y = 3 \cdot 3 + 3 (- \sqrt{5}) - \sqrt{5} (3 - \sqrt{5}) - 6 (3 - \sqrt{5}) + 18$

$x = 3 - \sqrt{5}$

Step 4.2.1.1.2.3

Apply the distributive property.

$y = 3 \cdot 3 + 3 (- \sqrt{5}) - \sqrt{5} \cdot 3 - \sqrt{5} (- \sqrt{5}) - 6 (3 - \sqrt{5}) + 18$

$x = 3 - \sqrt{5}$

$y = 3 \cdot 3 + 3 (- \sqrt{5}) - \sqrt{5} \cdot 3 - \sqrt{5} (- \sqrt{5}) - 6 (3 - \sqrt{5}) + 18$

$x = 3 - \sqrt{5}$

Step 4.2.1.1.3

Simplify and combine like terms.

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Step 4.2.1.1.3.1

Simplify each term.

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Step 4.2.1.1.3.1.1

Multiply $3$ by $3$ .

$y = 9 + 3 (- \sqrt{5}) - \sqrt{5} \cdot 3 - \sqrt{5} (- \sqrt{5}) - 6 (3 - \sqrt{5}) + 18$

$x = 3 - \sqrt{5}$

Step 4.2.1.1.3.1.2

Multiply $- 1$ by $3$ .

$y = 9 - 3 \sqrt{5} - \sqrt{5} \cdot 3 - \sqrt{5} (- \sqrt{5}) - 6 (3 - \sqrt{5}) + 18$

$x = 3 - \sqrt{5}$

Step 4.2.1.1.3.1.3

Multiply $3$ by $- 1$ .

$y = 9 - 3 \sqrt{5} - 3 \sqrt{5} - \sqrt{5} (- \sqrt{5}) - 6 (3 - \sqrt{5}) + 18$

$x = 3 - \sqrt{5}$

Step 4.2.1.1.3.1.4

Multiply $- \sqrt{5} (- \sqrt{5})$ .

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Step 4.2.1.1.3.1.4.1

Multiply $- 1$ by $- 1$ .

$y = 9 - 3 \sqrt{5} - 3 \sqrt{5} + 1 \sqrt{5} \sqrt{5} - 6 (3 - \sqrt{5}) + 18$

$x = 3 - \sqrt{5}$

Step 4.2.1.1.3.1.4.2

Multiply $\sqrt{5}$ by $1$ .

$y = 9 - 3 \sqrt{5} - 3 \sqrt{5} + \sqrt{5} \sqrt{5} - 6 (3 - \sqrt{5}) + 18$

$x = 3 - \sqrt{5}$

Step 4.2.1.1.3.1.4.3

Raise $\sqrt{5}$ to the power of $1$ .

$y = 9 - 3 \sqrt{5} - 3 \sqrt{5} + \sqrt{5} \sqrt{5} - 6 (3 - \sqrt{5}) + 18$

$x = 3 - \sqrt{5}$

Step 4.2.1.1.3.1.4.4

Raise $\sqrt{5}$ to the power of $1$ .

$y = 9 - 3 \sqrt{5} - 3 \sqrt{5} + \sqrt{5} \sqrt{5} - 6 (3 - \sqrt{5}) + 18$

$x = 3 - \sqrt{5}$

Step 4.2.1.1.3.1.4.5

Use the power rule $a^{m} a^{n} = a^{m + n}$ to combine exponents.

$y = 9 - 3 \sqrt{5} - 3 \sqrt{5} + {\sqrt{5}}^{1 + 1} - 6 (3 - \sqrt{5}) + 18$

$x = 3 - \sqrt{5}$

Step 4.2.1.1.3.1.4.6

Add $1$ and $1$ .

$y = 9 - 3 \sqrt{5} - 3 \sqrt{5} + {\sqrt{5}}^{2} - 6 (3 - \sqrt{5}) + 18$

$x = 3 - \sqrt{5}$

$y = 9 - 3 \sqrt{5} - 3 \sqrt{5} + {\sqrt{5}}^{2} - 6 (3 - \sqrt{5}) + 18$

$x = 3 - \sqrt{5}$

Step 4.2.1.1.3.1.5

Rewrite ${\sqrt{5}}^{2}$ as $5$ .

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Step 4.2.1.1.3.1.5.1

Use $\sqrt[n]{a^{x}} = a^{\frac{x}{n}}$ to rewrite $\sqrt{5}$ as $5^{\frac{1}{2}}$ .

$y = 9 - 3 \sqrt{5} - 3 \sqrt{5} + {(5^{\frac{1}{2}})}^{2} - 6 (3 - \sqrt{5}) + 18$

$x = 3 - \sqrt{5}$

Step 4.2.1.1.3.1.5.2

Apply the power rule and multiply exponents, ${(a^{m})}^{n} = a^{m n}$ .

$y = 9 - 3 \sqrt{5} - 3 \sqrt{5} + 5^{\frac{1}{2} \cdot 2} - 6 (3 - \sqrt{5}) + 18$

$x = 3 - \sqrt{5}$

Step 4.2.1.1.3.1.5.3

Combine $\frac{1}{2}$ and $2$ .

$y = 9 - 3 \sqrt{5} - 3 \sqrt{5} + 5^{\frac{2}{2}} - 6 (3 - \sqrt{5}) + 18$

$x = 3 - \sqrt{5}$

Step 4.2.1.1.3.1.5.4

Cancel the common factor of $2$ .

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Step 4.2.1.1.3.1.5.4.1

Cancel the common factor.

$y = 9 - 3 \sqrt{5} - 3 \sqrt{5} + 5^{\frac{2}{2}} - 6 (3 - \sqrt{5}) + 18$

$x = 3 - \sqrt{5}$

Step 4.2.1.1.3.1.5.4.2

Rewrite the expression.

$y = 9 - 3 \sqrt{5} - 3 \sqrt{5} + 5 - 6 (3 - \sqrt{5}) + 18$

$x = 3 - \sqrt{5}$

$y = 9 - 3 \sqrt{5} - 3 \sqrt{5} + 5 - 6 (3 - \sqrt{5}) + 18$

$x = 3 - \sqrt{5}$

Step 4.2.1.1.3.1.5.5

Evaluate the exponent.

$y = 9 - 3 \sqrt{5} - 3 \sqrt{5} + 5 - 6 (3 - \sqrt{5}) + 18$

$x = 3 - \sqrt{5}$

$y = 9 - 3 \sqrt{5} - 3 \sqrt{5} + 5 - 6 (3 - \sqrt{5}) + 18$

$x = 3 - \sqrt{5}$

$y = 9 - 3 \sqrt{5} - 3 \sqrt{5} + 5 - 6 (3 - \sqrt{5}) + 18$

$x = 3 - \sqrt{5}$

Step 4.2.1.1.3.2

Add $9$ and $5$ .

$y = 14 - 3 \sqrt{5} - 3 \sqrt{5} - 6 (3 - \sqrt{5}) + 18$

$x = 3 - \sqrt{5}$

Step 4.2.1.1.3.3

Subtract $3 \sqrt{5}$ from $- 3 \sqrt{5}$ .

$y = 14 - 6 \sqrt{5} - 6 (3 - \sqrt{5}) + 18$

$x = 3 - \sqrt{5}$

$y = 14 - 6 \sqrt{5} - 6 (3 - \sqrt{5}) + 18$

$x = 3 - \sqrt{5}$

Step 4.2.1.1.4

Apply the distributive property.

$y = 14 - 6 \sqrt{5} - 6 \cdot 3 - 6 (- \sqrt{5}) + 18$

$x = 3 - \sqrt{5}$

Step 4.2.1.1.5

Multiply $- 6$ by $3$ .

$y = 14 - 6 \sqrt{5} - 18 - 6 (- \sqrt{5}) + 18$

$x = 3 - \sqrt{5}$

Step 4.2.1.1.6

Multiply $- 1$ by $- 6$ .

$y = 14 - 6 \sqrt{5} - 18 + 6 \sqrt{5} + 18$

$x = 3 - \sqrt{5}$

$y = 14 - 6 \sqrt{5} - 18 + 6 \sqrt{5} + 18$

$x = 3 - \sqrt{5}$

Step 4.2.1.2

Simplify by adding terms.

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Step 4.2.1.2.1

Subtract $18$ from $14$ .

$y = - 4 - 6 \sqrt{5} + 6 \sqrt{5} + 18$

$x = 3 - \sqrt{5}$

Step 4.2.1.2.2

Add $- 4$ and $18$ .

$y = 14 - 6 \sqrt{5} + 6 \sqrt{5}$

$x = 3 - \sqrt{5}$

Step 4.2.1.2.3

Add $- 6 \sqrt{5}$ and $6 \sqrt{5}$ .

$y = 14 + 0$

$x = 3 - \sqrt{5}$

Step 4.2.1.2.4

Add $14$ and $0$ .

$y = 14$

$x = 3 - \sqrt{5}$

$y = 14$

$x = 3 - \sqrt{5}$

$y = 14$

$x = 3 - \sqrt{5}$

$y = 14$

$x = 3 - \sqrt{5}$

$y = 14$

$x = 3 - \sqrt{5}$

Step 5

Replace all occurrences of $x$ with $3 + \sqrt{5}$ in each equation.

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Step 5.1

Replace all occurrences of $x$ in $y = x^{2} - 6 x + 18$ with $3 + \sqrt{5}$ .

$y = {(3 + \sqrt{5})}^{2} - 6 (3 + \sqrt{5}) + 18$

$x = 3 + \sqrt{5}$

Step 5.2

Simplify the right side.

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Step 5.2.1

Simplify ${(3 + \sqrt{5})}^{2} - 6 (3 + \sqrt{5}) + 18$ .

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Step 5.2.1.1

Simplify each term.

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Step 5.2.1.1.1

Rewrite ${(3 + \sqrt{5})}^{2}$ as $(3 + \sqrt{5}) (3 + \sqrt{5})$ .

$y = (3 + \sqrt{5}) (3 + \sqrt{5}) - 6 (3 + \sqrt{5}) + 18$

$x = 3 + \sqrt{5}$

Step 5.2.1.1.2

Expand $(3 + \sqrt{5}) (3 + \sqrt{5})$ using the FOIL Method.

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Step 5.2.1.1.2.1

Apply the distributive property.

$y = 3 (3 + \sqrt{5}) + \sqrt{5} (3 + \sqrt{5}) - 6 (3 + \sqrt{5}) + 18$

$x = 3 + \sqrt{5}$

Step 5.2.1.1.2.2

Apply the distributive property.

$y = 3 \cdot 3 + 3 \sqrt{5} + \sqrt{5} (3 + \sqrt{5}) - 6 (3 + \sqrt{5}) + 18$

$x = 3 + \sqrt{5}$

Step 5.2.1.1.2.3

Apply the distributive property.

$y = 3 \cdot 3 + 3 \sqrt{5} + \sqrt{5} \cdot 3 + \sqrt{5} \sqrt{5} - 6 (3 + \sqrt{5}) + 18$

$x = 3 + \sqrt{5}$

$y = 3 \cdot 3 + 3 \sqrt{5} + \sqrt{5} \cdot 3 + \sqrt{5} \sqrt{5} - 6 (3 + \sqrt{5}) + 18$

$x = 3 + \sqrt{5}$

Step 5.2.1.1.3

Simplify and combine like terms.

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Step 5.2.1.1.3.1

Simplify each term.

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Step 5.2.1.1.3.1.1

Multiply $3$ by $3$ .

$y = 9 + 3 \sqrt{5} + \sqrt{5} \cdot 3 + \sqrt{5} \sqrt{5} - 6 (3 + \sqrt{5}) + 18$

$x = 3 + \sqrt{5}$

Step 5.2.1.1.3.1.2

Move $3$ to the left of $\sqrt{5}$ .

$y = 9 + 3 \sqrt{5} + 3 \cdot \sqrt{5} + \sqrt{5} \sqrt{5} - 6 (3 + \sqrt{5}) + 18$

$x = 3 + \sqrt{5}$

Step 5.2.1.1.3.1.3

Combine using the product rule for radicals.

$y = 9 + 3 \sqrt{5} + 3 \sqrt{5} + \sqrt{5 \cdot 5} - 6 (3 + \sqrt{5}) + 18$

$x = 3 + \sqrt{5}$

Step 5.2.1.1.3.1.4

Multiply $5$ by $5$ .

$y = 9 + 3 \sqrt{5} + 3 \sqrt{5} + \sqrt{25} - 6 (3 + \sqrt{5}) + 18$

$x = 3 + \sqrt{5}$

Step 5.2.1.1.3.1.5

Rewrite $25$ as $5^{2}$ .

$y = 9 + 3 \sqrt{5} + 3 \sqrt{5} + \sqrt{5^{2}} - 6 (3 + \sqrt{5}) + 18$

$x = 3 + \sqrt{5}$

Step 5.2.1.1.3.1.6

Pull terms out from under the radical, assuming positive real numbers.

$y = 9 + 3 \sqrt{5} + 3 \sqrt{5} + 5 - 6 (3 + \sqrt{5}) + 18$

$x = 3 + \sqrt{5}$

$y = 9 + 3 \sqrt{5} + 3 \sqrt{5} + 5 - 6 (3 + \sqrt{5}) + 18$

$x = 3 + \sqrt{5}$

Step 5.2.1.1.3.2

Add $9$ and $5$ .

$y = 14 + 3 \sqrt{5} + 3 \sqrt{5} - 6 (3 + \sqrt{5}) + 18$

$x = 3 + \sqrt{5}$

Step 5.2.1.1.3.3

Add $3 \sqrt{5}$ and $3 \sqrt{5}$ .

$y = 14 + 6 \sqrt{5} - 6 (3 + \sqrt{5}) + 18$

$x = 3 + \sqrt{5}$

$y = 14 + 6 \sqrt{5} - 6 (3 + \sqrt{5}) + 18$

$x = 3 + \sqrt{5}$

Step 5.2.1.1.4

Apply the distributive property.

$y = 14 + 6 \sqrt{5} - 6 \cdot 3 - 6 \sqrt{5} + 18$

$x = 3 + \sqrt{5}$

Step 5.2.1.1.5

Multiply $- 6$ by $3$ .

$y = 14 + 6 \sqrt{5} - 18 - 6 \sqrt{5} + 18$

$x = 3 + \sqrt{5}$

$y = 14 + 6 \sqrt{5} - 18 - 6 \sqrt{5} + 18$

$x = 3 + \sqrt{5}$

Step 5.2.1.2

Simplify by adding terms.

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Step 5.2.1.2.1

Subtract $18$ from $14$ .

$y = - 4 + 6 \sqrt{5} - 6 \sqrt{5} + 18$

$x = 3 + \sqrt{5}$

Step 5.2.1.2.2

Add $- 4$ and $18$ .

$y = 14 + 6 \sqrt{5} - 6 \sqrt{5}$

$x = 3 + \sqrt{5}$

Step 5.2.1.2.3

Subtract $6 \sqrt{5}$ from $6 \sqrt{5}$ .

$y = 14 + 0$

$x = 3 + \sqrt{5}$

Step 5.2.1.2.4

Add $14$ and $0$ .

$y = 14$

$x = 3 + \sqrt{5}$

$y = 14$

$x = 3 + \sqrt{5}$

$y = 14$

$x = 3 + \sqrt{5}$

$y = 14$

$x = 3 + \sqrt{5}$

$y = 14$

$x = 3 + \sqrt{5}$

Step 6

The solution to the system is the complete set of ordered pairs that are valid solutions.

$(3 - \sqrt{5}, 14)$

$(3 + \sqrt{5}, 14)$

Step 7

The result can be shown in multiple forms.

Point Form:

$(3 - \sqrt{5}, 14), (3 + \sqrt{5}, 14)$

Equation Form:

$x = 3 - \sqrt{5}, y = 14$

$x = 3 + \sqrt{5}, y = 14$

Step 8