Precalculus Examples

$(0, - \sqrt{7})$

Step 1

Convert from rectangular coordinates $(x, y)$ to polar coordinates $(r, θ)$ using the conversion formulas.

$r = \sqrt{x^{2} + y^{2}}$

$θ = t a n^{- 1} (\frac{y}{x})$

Step 2

Replace $x$ and $y$ with the actual values.

$r = \sqrt{{(0)}^{2} + {(- \sqrt{7})}^{2}}$

$θ = t a n^{- 1} (\frac{y}{x})$

Step 3

Find the magnitude of the polar coordinate.

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Step 3.1

Simplify the expression.

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Step 3.1.1

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

$r = \sqrt{0 + {(- \sqrt{7})}^{2}}$

$θ = t a n^{- 1} (\frac{y}{x})$

Step 3.1.2

Apply the product rule to $- \sqrt{7}$ .

$r = \sqrt{0 + {(- 1)}^{2} {\sqrt{7}}^{2}}$

$θ = t a n^{- 1} (\frac{y}{x})$

Step 3.1.3

Raise $- 1$ to the power of $2$ .

$r = \sqrt{0 + 1 {\sqrt{7}}^{2}}$

$θ = t a n^{- 1} (\frac{y}{x})$

Step 3.1.4

Multiply ${\sqrt{7}}^{2}$ by $1$ .

$r = \sqrt{0 + {\sqrt{7}}^{2}}$

$θ = t a n^{- 1} (\frac{y}{x})$

$r = \sqrt{0 + {\sqrt{7}}^{2}}$

$θ = t a n^{- 1} (\frac{y}{x})$

Step 3.2

Rewrite ${\sqrt{7}}^{2}$ as $7$ .

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Step 3.2.1

Use $\sqrt[n]{a^{x}} = a^{\frac{x}{n}}$ to rewrite $\sqrt{7}$ as $7^{\frac{1}{2}}$ .

$r = \sqrt{0 + {(7^{\frac{1}{2}})}^{2}}$

$θ = t a n^{- 1} (\frac{y}{x})$

Step 3.2.2

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

$r = \sqrt{0 + 7^{\frac{1}{2} \cdot 2}}$

$θ = t a n^{- 1} (\frac{y}{x})$

Step 3.2.3

Combine $\frac{1}{2}$ and $2$ .

$r = \sqrt{0 + 7^{\frac{2}{2}}}$

$θ = t a n^{- 1} (\frac{y}{x})$

Step 3.2.4

Cancel the common factor of $2$ .

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Step 3.2.4.1

Cancel the common factor.

$r = \sqrt{0 + 7^{\frac{2}{2}}}$

$θ = t a n^{- 1} (\frac{y}{x})$

Step 3.2.4.2

Rewrite the expression.

$r = \sqrt{0 + 7}$

$θ = t a n^{- 1} (\frac{y}{x})$

$r = \sqrt{0 + 7}$

$θ = t a n^{- 1} (\frac{y}{x})$

Step 3.2.5

Evaluate the exponent.

$r = \sqrt{0 + 7}$

$θ = t a n^{- 1} (\frac{y}{x})$

$r = \sqrt{0 + 7}$

$θ = t a n^{- 1} (\frac{y}{x})$

Step 3.3

Add $0$ and $7$ .

$r = \sqrt{7}$

$θ = t a n^{- 1} (\frac{y}{x})$

$r = \sqrt{7}$

$θ = t a n^{- 1} (\frac{y}{x})$

Step 4

Replace $x$ and $y$ with the actual values.

$r = \sqrt{7}$

$θ = t a n^{- 1} (\frac{- \sqrt{7}}{0})$

Step 5

The inverse tangent of Undefined is $θ = 270 °$ .

$r = \sqrt{7}$

$θ = 270 °$

Step 6

This is the result of the conversion to polar coordinates in $(r, θ)$ form.

$(\sqrt{7}, 270 °)$