Find the Standard Form of the Parabola y^2+4x-8y-4=0

$y^{2} + 4 x - 8 y - 4 = 0$

Step 1

Move all terms not containing $y$ to the right side of the equation.

Subtract $4 x$ from both sides of the equation.

$y^{2} - 8 y - 4 = - 4 x$

Add $4$ to both sides of the equation.

$y^{2} - 8 y = - 4 x + 4$

Step 2

Complete the square.

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

$a = 1$

$b = - 8$

$c = 0 = - 4 x + 4$

Consider the vertex form of a parabola.

$a {(x + d)}^{2} + e = - 4 x + 4$

Find the value of $d$ using the formula $d = \frac{b}{2 a}$ .

Substitute the values of $a$ and $b$ into the formula $d = \frac{b}{2 a}$ .

$d = \frac{- 8}{2 \cdot 1}$

Cancel the common factor of $- 8$ and $2$ .

Factor $2$ out of $- 8$ .

$d = \frac{2 \cdot - 4}{2 \cdot 1}$

Cancel the common factors.

Factor $2$ out of $2 \cdot 1$ .

$d = \frac{2 \cdot - 4}{2 (1)}$

Cancel the common factor.

$d = \frac{2 \cdot - 4}{2 \cdot 1}$

Rewrite the expression.

$d = \frac{- 4}{1}$

Divide $- 4$ by $1$ .

$d = - 4$

Find the value of $e$ using the formula $e = c - \frac{b^{2}}{4 a}$ .

Substitute the values of $c$ , $b$ and $a$ into the formula $e = c - \frac{b^{2}}{4 a}$ .

$e = 0 - \frac{{(- 8)}^{2}}{4 \cdot 1}$

Simplify the right side.

Simplify each term.

Raise $- 8$ to the power of $2$ .

$e = 0 - \frac{64}{4 \cdot 1}$

Multiply $4$ by $1$ .

$e = 0 - \frac{64}{4}$

Divide $64$ by $4$ .

$e = 0 - 1 \cdot 16$

Multiply $- 1$ by $16$ .

$e = 0 - 16$

Subtract $16$ from $0$ .

$e = - 16$

Substitute the values of $a$ , $d$ , and $e$ into the vertex form ${(y - 4)}^{2} - 16$ .

${(y - 4)}^{2} - 16 = - 4 x + 4$

Step 3

Move all terms not containing $y$ to the right side of the equation.

Add $16$ to both sides of the equation.

${(y - 4)}^{2} = - 4 x + 4 + 16$

Add $4$ and $16$ .

${(y - 4)}^{2} = - 4 x + 20$

Step 4

Factor.

Factor $4$ out of $- 4 x + 20$ .

Factor $4$ out of $- 4 x$ .

${(y - 4)}^{2} = 4 (- x) + 20$

Factor $4$ out of $20$ .

${(y - 4)}^{2} = 4 (- x) + 4 (5)$

Factor $4$ out of $4 (- x) + 4 (5)$ .

${(y - 4)}^{2} = 4 (- x + 5)$

Factor $- 1$ out of $- x$ .

${(y - 4)}^{2} = 4 (- (x) + 5)$

Rewrite $5$ as $- 1 (- 5)$ .

${(y - 4)}^{2} = 4 (- (x) - 1 (- 5))$

Factor $- 1$ out of $- (x) - 1 (- 5)$ .

${(y - 4)}^{2} = 4 (- (x - 5))$

Multiply $- 1$ by $4$ .

${(y - 4)}^{2} = - 4 (x - 5)$

Find the Standard Form of the Parabola y^2+4x-8y-4=0

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