Find the x and y Intercepts x^2+8x+7

$x^{2} + 8 x + 7$

Step 1

Write $x^{2} + 8 x + 7$ as an equation.

$y = x^{2} + 8 x + 7$

Step 2

Find the x-intercepts.

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

$0 = x^{2} + 8 x + 7$

Solve the equation.

Rewrite the equation as $x^{2} + 8 x + 7 = 0$ .

$x^{2} + 8 x + 7 = 0$

Factor $x^{2} + 8 x + 7$ using the AC method.

Consider the form $x^{2} + b x + c$ . Find a pair of integers whose product is $c$ and whose sum is $b$ . In this case, whose product is $7$ and whose sum is $8$ .

$1, 7$

Write the factored form using these integers.

$(x + 1) (x + 7) = 0$

If any individual factor on the left side of the equation is equal to $0$ , the entire expression will be equal to $0$ .

$x + 1 = 0$

$x + 7 = 0$

Set $x + 1$ equal to $0$ and solve for $x$ .

Set $x + 1$ equal to $0$ .

$x + 1 = 0$

Subtract $1$ from both sides of the equation.

$x = - 1$

Set $x + 7$ equal to $0$ and solve for $x$ .

Set $x + 7$ equal to $0$ .

$x + 7 = 0$

Subtract $7$ from both sides of the equation.

$x = - 7$

The final solution is all the values that make $(x + 1) (x + 7) = 0$ true.

$x = - 1, - 7$

x-intercept(s) in point form.

x-intercept(s): $(- 1, 0), (- 7, 0)$

Step 3

Find the y-intercepts.

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

$y = {(0)}^{2} + 8 (0) + 7$

Solve the equation.

Remove parentheses.

$y = 0^{2} + 8 (0) + 7$

Remove parentheses.

$y = {(0)}^{2} + 8 (0) + 7$

Simplify ${(0)}^{2} + 8 (0) + 7$ .

Simplify each term.

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

$y = 0 + 8 (0) + 7$

Multiply $8$ by $0$ .

$y = 0 + 0 + 7$

Simplify by adding numbers.

Add $0$ and $0$ .

$y = 0 + 7$

Add $0$ and $7$ .

$y = 7$

y-intercept(s) in point form.

y-intercept(s): $(0, 7)$

Step 4

List the intersections.

x-intercept(s): $(- 1, 0), (- 7, 0)$

y-intercept(s): $(0, 7)$

Step 5

Find the x and y Intercepts x^2+8x+7

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