Find the Vertex y=-5x^2-10x-13

$y = - 5 x^{2} - 10 x - 13$

Step 1

Rewrite the equation in vertex form.

Complete the square for $- 5 x^{2} - 10 x - 13$ .

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

$a = - 5$

$b = - 10$

$c = - 13$

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

$d = \frac{- 10}{2 \cdot - 5}$

Simplify the right side.

Cancel the common factor of $- 10$ and $2$ .

Factor $2$ out of $- 10$ .

$d = \frac{2 \cdot - 5}{2 \cdot - 5}$

Cancel the common factors.

Factor $2$ out of $2 \cdot - 5$ .

$d = \frac{2 \cdot - 5}{2 (- 5)}$

Cancel the common factor.

$d = \frac{2 \cdot - 5}{2 \cdot - 5}$

Rewrite the expression.

$d = \frac{- 5}{- 5}$

Cancel the common factor of $- 5$ .

Cancel the common factor.

$d = \frac{- 5}{- 5}$

Rewrite the expression.

$d = 1$

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

$e = - 13 - \frac{{(- 10)}^{2}}{4 \cdot - 5}$

Simplify the right side.

Simplify each term.

Raise $- 10$ to the power of $2$ .

$e = - 13 - \frac{100}{4 \cdot - 5}$

Multiply $4$ by $- 5$ .

$e = - 13 - \frac{100}{- 20}$

Divide $100$ by $- 20$ .

$e = - 13 - - 5$

Multiply $- 1$ by $- 5$ .

$e = - 13 + 5$

Add $- 13$ and $5$ .

$e = - 8$

Substitute the values of $a$ , $d$ , and $e$ into the vertex form $- 5 {(x + 1)}^{2} - 8$ .

$- 5 {(x + 1)}^{2} - 8$

Set $y$ equal to the new right side.

$y = - 5 {(x + 1)}^{2} - 8$

Step 2

Use the vertex form, $y = a {(x - h)}^{2} + k$ , to determine the values of $a$ , $h$ , and $k$ .

$a = - 5$

$h = - 1$

$k = - 8$

Step 3

Find the vertex $(h, k)$ .

$(- 1, - 8)$

Step 4

Find the Vertex y=-5x^2-10x-13

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