Find the x and y Intercepts y=x^2+8x+16

$y = x^{2} + 8 x + 16$

Step 1

Find the x-intercepts.

To find the x-intercept(s), substitute in $0$ for $y$ and solve for $x$ .

$0 = x^{2} + 8 x + 16$

Solve the equation.

Rewrite the equation as $x^{2} + 8 x + 16 = 0$ .

$x^{2} + 8 x + 16 = 0$

Factor using the perfect square rule.

Rewrite $16$ as $4^{2}$ .

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

Check that the middle term is two times the product of the numbers being squared in the first term and third term.

$8 x = 2 \cdot x \cdot 4$

Rewrite the polynomial.

$x^{2} + 2 \cdot x \cdot 4 + 4^{2} = 0$

Factor using the perfect square trinomial rule $a^{2} + 2 a b + b^{2} = {(a + b)}^{2}$ , where $a = x$ and $b = 4$ .

${(x + 4)}^{2} = 0$

Set the $x + 4$ equal to $0$ .

$x + 4 = 0$

Subtract $4$ from both sides of the equation.

$x = - 4$

x-intercept(s) in point form.

x-intercept(s): $(- 4, 0)$

Step 2

Find the y-intercepts.

To find the y-intercept(s), substitute in $0$ for $x$ and solve for $y$ .

$y = {(0)}^{2} + 8 (0) + 16$

Solve the equation.

Remove parentheses.

$y = 0^{2} + 8 (0) + 16$

Remove parentheses.

$y = {(0)}^{2} + 8 (0) + 16$

Simplify ${(0)}^{2} + 8 (0) + 16$ .

Simplify each term.

Raising $0$ to any positive power yields $0$ .

$y = 0 + 8 (0) + 16$

Multiply $8$ by $0$ .

$y = 0 + 0 + 16$

Simplify by adding numbers.

Add $0$ and $0$ .

$y = 0 + 16$

Add $0$ and $16$ .

$y = 16$

y-intercept(s) in point form.

y-intercept(s): $(0, 16)$

Step 3

List the intersections.

x-intercept(s): $(- 4, 0)$

y-intercept(s): $(0, 16)$

Step 4

Find the x and y Intercepts y=x^2+8x+16

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