Find the Vertex Form h(x)=x^2+20x-17

$h (x) = x^{2} + 20 x - 17$

Step 1

Write $h (x) = x^{2} + 20 x - 17$ as an equation.

$y = x^{2} + 20 x - 17$

Step 2

Complete the square for $x^{2} + 20 x - 17$ .

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

$a = 1$

$b = 20$

$c = - 17$

Consider the vertex form of a parabola.

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

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

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

$d = \frac{20}{2 \cdot 1}$

Cancel the common factor of $20$ and $2$ .

Factor $2$ out of $20$ .

$d = \frac{2 \cdot 10}{2 \cdot 1}$

Cancel the common factors.

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

$d = \frac{2 \cdot 10}{2 (1)}$

Cancel the common factor.

$d = \frac{2 \cdot 10}{2 \cdot 1}$

Rewrite the expression.

$d = \frac{10}{1}$

Divide $10$ by $1$ .

$d = 10$

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

$e = - 17 - \frac{20^{2}}{4 \cdot 1}$

Simplify the right side.

Simplify each term.

Raise $20$ to the power of $2$ .

$e = - 17 - \frac{400}{4 \cdot 1}$

Multiply $4$ by $1$ .

$e = - 17 - \frac{400}{4}$

Divide $400$ by $4$ .

$e = - 17 - 1 \cdot 100$

Multiply $- 1$ by $100$ .

$e = - 17 - 100$

Subtract $100$ from $- 17$ .

$e = - 117$

Substitute the values of $a$ , $d$ , and $e$ into the vertex form ${(x + 10)}^{2} - 117$ .

${(x + 10)}^{2} - 117$

Step 3

Set $y$ equal to the new right side.

$y = {(x + 10)}^{2} - 117$

Find the Vertex Form h(x)=x^2+20x-17

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