Algebra Examples

${(x + 5)}^{2} - 9$

Step 1

Write ${(x + 5)}^{2} - 9$ as an equation.

$y = {(x + 5)}^{2} - 9$

Step 2

Find the x-intercepts.

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Step 2.1

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

$0 = {(x + 5)}^{2} - 9$

Step 2.2

Solve the equation.

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Step 2.2.1

Rewrite the equation as ${(x + 5)}^{2} - 9 = 0$ .

${(x + 5)}^{2} - 9 = 0$

Step 2.2.2

Add $9$ to both sides of the equation.

${(x + 5)}^{2} = 9$

Step 2.2.3

Take the specified root of both sides of the equation to eliminate the exponent on the left side.

$x + 5 = \pm \sqrt{9}$

Step 2.2.4

Simplify $\pm \sqrt{9}$ .

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Step 2.2.4.1

Rewrite $9$ as $3^{2}$ .

$x + 5 = \pm \sqrt{3^{2}}$

Step 2.2.4.2

Pull terms out from under the radical, assuming positive real numbers.

$x + 5 = \pm 3$

Step 2.2.5

The complete solution is the result of both the positive and negative portions of the solution.

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Step 2.2.5.1

First, use the positive value of the $\pm$ to find the first solution.

$x + 5 = 3$

Step 2.2.5.2

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

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Step 2.2.5.2.1

Subtract $5$ from both sides of the equation.

$x = 3 - 5$

Step 2.2.5.2.2

Subtract $5$ from $3$ .

$x = - 2$

Step 2.2.5.3

Next, use the negative value of the $\pm$ to find the second solution.

$x + 5 = - 3$

Step 2.2.5.4

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

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Step 2.2.5.4.1

Subtract $5$ from both sides of the equation.

$x = - 3 - 5$

Step 2.2.5.4.2

Subtract $5$ from $- 3$ .

$x = - 8$

Step 2.2.5.5

The complete solution is the result of both the positive and negative portions of the solution.

$x = - 2, - 8$

Step 2.3

x-intercept(s) in point form.

x-intercept(s): $(- 2, 0), (- 8, 0)$

Step 3

Find the y-intercepts.

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Step 3.1

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

$y = {((0) + 5)}^{2} - 9$

Step 3.2

Solve the equation.

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Step 3.2.1

Remove parentheses.

$y = {(0 + 5)}^{2} - 9$

Step 3.2.2

Remove parentheses.

$y = {((0) + 5)}^{2} - 9$

Step 3.2.3

Simplify ${((0) + 5)}^{2} - 9$ .

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Step 3.2.3.1

Simplify each term.

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Step 3.2.3.1.1

Add $0$ and $5$ .

$y = 5^{2} - 9$

Step 3.2.3.1.2

Raise $5$ to the power of $2$ .

$y = 25 - 9$

Step 3.2.3.2

Subtract $9$ from $25$ .

$y = 16$

Step 3.3

y-intercept(s) in point form.

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

Step 4

List the intersections.

x-intercept(s): $(- 2, 0), (- 8, 0)$

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

Step 5