Examples

$x^{2} - y^{2} + 12 x - 12 y - 3 = 0$

Step 1

Add

$3$ to both sides of the equation.

$x^{2} - y^{2} + 12 x - 12 y = 3$

Step 2

Complete the square for

$x^{2} + 12 x$ .

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Step 2.1

Use the form

$a x^{2} + b x + c$ , to find the values of

$a$ ,

$b$ , and

$c$ .

$a = 1$

$b = 12$

$c = 0$

Step 2.2

Consider the vertex form of a parabola.

$a {(x + d)}^{2} + e$

Step 2.3

Find the value of

$d$ using the formula

$d = \frac{b}{2 a}$ .

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Step 2.3.1

Substitute the values of

$a$ and

$b$ into the formula

$d = \frac{b}{2 a}$ .

$d = \frac{12}{2 \cdot 1}$

Step 2.3.2

Cancel the common factor of

$12$ and

$2$ .

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Step 2.3.2.1

Factor

$2$ out of

$12$ .

$d = \frac{2 \cdot 6}{2 \cdot 1}$

Step 2.3.2.2

Cancel the common factors.

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Step 2.3.2.2.1

Factor

$2$ out of

$2 \cdot 1$ .

$d = \frac{2 \cdot 6}{2 (1)}$

Step 2.3.2.2.2

Cancel the common factor.

$d = \frac{2 \cdot 6}{2 \cdot 1}$

Step 2.3.2.2.3

Rewrite the expression.

$d = \frac{6}{1}$

Step 2.3.2.2.4

Divide

$6$ by

$1$ .

$d = 6$

Step 2.4

Find the value of

$e$ using the formula

$e = c - \frac{b^{2}}{4 a}$ .

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Step 2.4.1

Substitute the values of

$c$ ,

$b$ and

$a$ into the formula

$e = c - \frac{b^{2}}{4 a}$ .

$e = 0 - \frac{12^{2}}{4 \cdot 1}$

Step 2.4.2

Simplify the right side.

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Step 2.4.2.1

Simplify each term.

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Step 2.4.2.1.1

Raise

$12$ to the power of

$2$ .

$e = 0 - \frac{144}{4 \cdot 1}$

Step 2.4.2.1.2

Multiply

$4$ by

$1$ .

$e = 0 - \frac{144}{4}$

Step 2.4.2.1.3

Divide

$144$ by

$4$ .

$e = 0 - 1 \cdot 36$

Step 2.4.2.1.4

Multiply

$- 1$ by

$36$ .

$e = 0 - 36$

Step 2.4.2.2

Subtract

$36$ from

$0$ .

$e = - 36$

Step 2.5

Substitute the values of

$a$ ,

$d$ , and

$e$ into the vertex form

${(x + 6)}^{2} - 36$ .

${(x + 6)}^{2} - 36$

Step 3

Substitute

${(x + 6)}^{2} - 36$ for

$x^{2} + 12 x$ in the equation

$x^{2} - y^{2} + 12 x - 12 y = 3$ .

${(x + 6)}^{2} - 36 - y^{2} - 12 y = 3$

Step 4

Move

$- 36$ to the right side of the equation by adding

$36$ to both sides.

${(x + 6)}^{2} - y^{2} - 12 y = 3 + 36$

Step 5

Complete the square for

$- y^{2} - 12 y$ .

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Step 5.1

Use the form

$a x^{2} + b x + c$ , to find the values of

$a$ ,

$b$ , and

$c$ .

$a = - 1$

$b = - 12$

$c = 0$

Step 5.2

Consider the vertex form of a parabola.

$a {(x + d)}^{2} + e$

Step 5.3

Find the value of

$d$ using the formula

$d = \frac{b}{2 a}$ .

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Step 5.3.1

Substitute the values of

$a$ and

$b$ into the formula

$d = \frac{b}{2 a}$ .

$d = \frac{- 12}{2 \cdot - 1}$

Step 5.3.2

Simplify the right side.

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Step 5.3.2.1

Cancel the common factor of

$- 12$ and

$2$ .

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Step 5.3.2.1.1

Factor

$2$ out of

$- 12$ .

$d = \frac{2 \cdot - 6}{2 \cdot - 1}$

Step 5.3.2.1.2

Move the negative one from the denominator of

$\frac{- 6}{- 1}$ .

$d = - 1 \cdot - 6$

Step 5.3.2.2

Rewrite

$- 1 \cdot - 6$ as

$- - 6$ .

$d = - - 6$

Step 5.3.2.3

Multiply

$- 1$ by

$- 6$ .

$d = 6$

Step 5.4

Find the value of

$e$ using the formula

$e = c - \frac{b^{2}}{4 a}$ .

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Step 5.4.1

Substitute the values of

$c$ ,

$b$ and

$a$ into the formula

$e = c - \frac{b^{2}}{4 a}$ .

$e = 0 - \frac{{(- 12)}^{2}}{4 \cdot - 1}$

Step 5.4.2

Simplify the right side.

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Step 5.4.2.1

Simplify each term.

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Step 5.4.2.1.1

Raise

$- 12$ to the power of

$2$ .

$e = 0 - \frac{144}{4 \cdot - 1}$

Step 5.4.2.1.2

Multiply

$4$ by

$- 1$ .

$e = 0 - \frac{144}{- 4}$

Step 5.4.2.1.3

Divide

$144$ by

$- 4$ .

$e = 0 - - 36$

Step 5.4.2.1.4

Multiply

$- 1$ by

$- 36$ .

$e = 0 + 36$

Step 5.4.2.2

Add

$0$ and

$36$ .

$e = 36$

Step 5.5

Substitute the values of

$a$ ,

$d$ , and

$e$ into the vertex form

$- {(y + 6)}^{2} + 36$ .

$- {(y + 6)}^{2} + 36$

Step 6

Substitute

$- {(y + 6)}^{2} + 36$ for

$- y^{2} - 12 y$ in the equation

$x^{2} - y^{2} + 12 x - 12 y = 3$ .

${(x + 6)}^{2} - {(y + 6)}^{2} + 36 = 3 + 36$

Step 7

Move

$36$ to the right side of the equation by adding

$36$ to both sides.

${(x + 6)}^{2} - {(y + 6)}^{2} = 3 + 36 - 36$

Step 8

Simplify

$3 + 36 - 36$ .

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Step 8.1

Add

$3$ and

$36$ .

${(x + 6)}^{2} - {(y + 6)}^{2} = 39 - 36$

Step 8.2

Subtract

$36$ from

$39$ .

${(x + 6)}^{2} - {(y + 6)}^{2} = 3$

Step 9

Divide each term by

$3$ to make the right side equal to one.

$\frac{{(x + 6)}^{2}}{3} - \frac{{(y + 6)}^{2}}{3} = \frac{3}{3}$

Step 10

Simplify each term in the equation in order to set the right side equal to

$1$ . The standard form of an ellipse or hyperbola requires the right side of the equation be

$1$ .

$\frac{{(x + 6)}^{2}}{3} - \frac{{(y + 6)}^{2}}{3} = 1$

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