Algebra Examples

$y = 7 {(x - 3)}^{2} + 4$

Step 1

To write a polynomial in standard form, simplify and then arrange the terms in descending order.

$y = a x^{2} + b x + c$

Step 2

Simplify each term.

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Step 2.1

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

$y = 7 ((x - 3) (x - 3)) + 4$

Step 2.2

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

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Step 2.2.1

Apply the distributive property.

$y = 7 (x (x - 3) - 3 (x - 3)) + 4$

Step 2.2.2

Apply the distributive property.

$y = 7 (x \cdot x + x \cdot - 3 - 3 (x - 3)) + 4$

Step 2.2.3

Apply the distributive property.

$y = 7 (x \cdot x + x \cdot - 3 - 3 x - 3 \cdot - 3) + 4$

Step 2.3

Simplify and combine like terms.

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Step 2.3.1

Simplify each term.

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Step 2.3.1.1

Multiply $x$ by $x$ .

$y = 7 (x^{2} + x \cdot - 3 - 3 x - 3 \cdot - 3) + 4$

Step 2.3.1.2

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

$y = 7 (x^{2} - 3 \cdot x - 3 x - 3 \cdot - 3) + 4$

Step 2.3.1.3

Multiply $- 3$ by $- 3$ .

$y = 7 (x^{2} - 3 x - 3 x + 9) + 4$

Step 2.3.2

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

$y = 7 (x^{2} - 6 x + 9) + 4$

Step 2.4

Apply the distributive property.

$y = 7 x^{2} + 7 (- 6 x) + 7 \cdot 9 + 4$

Step 2.5

Simplify.

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Step 2.5.1

Multiply $- 6$ by $7$ .

$y = 7 x^{2} - 42 x + 7 \cdot 9 + 4$

Step 2.5.2

Multiply $7$ by $9$ .

$y = 7 x^{2} - 42 x + 63 + 4$

Step 3

Add $63$ and $4$ .

$y = 7 x^{2} - 42 x + 67$

Step 4