Precalculus Examples

$y = \sqrt{x + 25}$

Step 1

Find the x-intercepts.

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Step 1.1

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

$0 = \sqrt{x + 25}$

Step 1.2

Solve the equation.

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Step 1.2.1

Rewrite the equation as $\sqrt{x + 25} = 0$ .

$\sqrt{x + 25} = 0$

Step 1.2.2

To remove the radical on the left side of the equation, square both sides of the equation.

${\sqrt{x + 25}}^{2} = 0^{2}$

Step 1.2.3

Simplify each side of the equation.

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Step 1.2.3.1

Use $\sqrt[n]{a^{x}} = a^{\frac{x}{n}}$ to rewrite $\sqrt{x + 25}$ as ${(x + 25)}^{\frac{1}{2}}$ .

${({(x + 25)}^{\frac{1}{2}})}^{2} = 0^{2}$

Step 1.2.3.2

Simplify the left side.

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Step 1.2.3.2.1

Simplify ${({(x + 25)}^{\frac{1}{2}})}^{2}$ .

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Step 1.2.3.2.1.1

Multiply the exponents in ${({(x + 25)}^{\frac{1}{2}})}^{2}$ .

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Step 1.2.3.2.1.1.1

Apply the power rule and multiply exponents, ${(a^{m})}^{n} = a^{m n}$ .

${(x + 25)}^{\frac{1}{2} \cdot 2} = 0^{2}$

Step 1.2.3.2.1.1.2

Cancel the common factor of $2$ .

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Step 1.2.3.2.1.1.2.1

Cancel the common factor.

${(x + 25)}^{\frac{1}{2} \cdot 2} = 0^{2}$

Step 1.2.3.2.1.1.2.2

Rewrite the expression.

${(x + 25)}^{1} = 0^{2}$

Step 1.2.3.2.1.2

Simplify.

$x + 25 = 0^{2}$

Step 1.2.3.3

Simplify the right side.

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Step 1.2.3.3.1

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

$x + 25 = 0$

Step 1.2.4

Subtract $25$ from both sides of the equation.

$x = - 25$

Step 1.3

x-intercept(s) in point form.

x-intercept(s): $(- 25, 0)$

Step 2

Find the y-intercepts.

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Step 2.1

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

$y = \sqrt{(0) + 25}$

Step 2.2

Simplify $\sqrt{(0) + 25}$ .

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Step 2.2.1

Add $0$ and $25$ .

$y = \sqrt{25}$

Step 2.2.2

Rewrite $25$ as $5^{2}$ .

$y = \sqrt{5^{2}}$

Step 2.2.3

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

$y = 5$

Step 2.3

y-intercept(s) in point form.

y-intercept(s): $(0, 5)$

Step 3

List the intersections.

x-intercept(s): $(- 25, 0)$

y-intercept(s): $(0, 5)$

Step 4