Algebra Examples

$3 (\cos (\frac{π}{3}) + i \sin (\frac{π}{3})) \cdot 5 (\cos (\frac{π}{4}) + i \sin (\frac{π}{4}))$

Step 1

Simplify each term.

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Step 1.1

The exact value of $\cos (\frac{π}{3})$ is $\frac{1}{2}$ .

$3 (\frac{1}{2} + i \sin (\frac{π}{3})) \cdot 5 (\cos (\frac{π}{4}) + i \sin (\frac{π}{4}))$

Step 1.2

The exact value of $\sin (\frac{π}{3})$ is $\frac{\sqrt{3}}{2}$ .

$3 (\frac{1}{2} + i \frac{\sqrt{3}}{2}) \cdot 5 (\cos (\frac{π}{4}) + i \sin (\frac{π}{4}))$

Step 1.3

Combine $i$ and $\frac{\sqrt{3}}{2}$ .

$3 (\frac{1}{2} + \frac{i \sqrt{3}}{2}) \cdot 5 (\cos (\frac{π}{4}) + i \sin (\frac{π}{4}))$

Step 2

Simplify terms.

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Step 2.1

Apply the distributive property.

$(3 (\frac{1}{2}) + 3 \frac{i \sqrt{3}}{2}) \cdot 5 (\cos (\frac{π}{4}) + i \sin (\frac{π}{4}))$

Step 2.2

Combine $3$ and $\frac{1}{2}$ .

$(\frac{3}{2} + 3 \frac{i \sqrt{3}}{2}) \cdot 5 (\cos (\frac{π}{4}) + i \sin (\frac{π}{4}))$

Step 2.3

Combine $3$ and $\frac{i \sqrt{3}}{2}$ .

$(\frac{3}{2} + \frac{3 (i \sqrt{3})}{2}) \cdot 5 (\cos (\frac{π}{4}) + i \sin (\frac{π}{4}))$

Step 2.4

Apply the distributive property.

$(\frac{3}{2} \cdot 5 + \frac{3 i \sqrt{3}}{2} \cdot 5) (\cos (\frac{π}{4}) + i \sin (\frac{π}{4}))$

Step 3

Multiply $\frac{3}{2} \cdot 5$ .

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Step 3.1

Combine $\frac{3}{2}$ and $5$ .

$(\frac{3 \cdot 5}{2} + \frac{3 i \sqrt{3}}{2} \cdot 5) (\cos (\frac{π}{4}) + i \sin (\frac{π}{4}))$

Step 3.2

Multiply $3$ by $5$ .

$(\frac{15}{2} + \frac{3 i \sqrt{3}}{2} \cdot 5) (\cos (\frac{π}{4}) + i \sin (\frac{π}{4}))$

Step 4

Multiply $\frac{3 i \sqrt{3}}{2} \cdot 5$ .

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Step 4.1

Combine $\frac{3 i \sqrt{3}}{2}$ and $5$ .

$(\frac{15}{2} + \frac{3 i \sqrt{3} \cdot 5}{2}) (\cos (\frac{π}{4}) + i \sin (\frac{π}{4}))$

Step 4.2

Multiply $5$ by $3$ .

$(\frac{15}{2} + \frac{15 i \sqrt{3}}{2}) (\cos (\frac{π}{4}) + i \sin (\frac{π}{4}))$

Step 5

Simplify each term.

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Step 5.1

The exact value of $\cos (\frac{π}{4})$ is $\frac{\sqrt{2}}{2}$ .

$(\frac{15}{2} + \frac{15 i \sqrt{3}}{2}) (\frac{\sqrt{2}}{2} + i \sin (\frac{π}{4}))$

Step 5.2

The exact value of $\sin (\frac{π}{4})$ is $\frac{\sqrt{2}}{2}$ .

$(\frac{15}{2} + \frac{15 i \sqrt{3}}{2}) (\frac{\sqrt{2}}{2} + i \frac{\sqrt{2}}{2})$

Step 5.3

Combine $i$ and $\frac{\sqrt{2}}{2}$ .

$(\frac{15}{2} + \frac{15 i \sqrt{3}}{2}) (\frac{\sqrt{2}}{2} + \frac{i \sqrt{2}}{2})$

Step 6

Expand $(\frac{15}{2} + \frac{15 i \sqrt{3}}{2}) (\frac{\sqrt{2}}{2} + \frac{i \sqrt{2}}{2})$ using the FOIL Method.

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Step 6.1

Apply the distributive property.

$\frac{15}{2} (\frac{\sqrt{2}}{2} + \frac{i \sqrt{2}}{2}) + \frac{15 i \sqrt{3}}{2} (\frac{\sqrt{2}}{2} + \frac{i \sqrt{2}}{2})$

Step 6.2

Apply the distributive property.

$\frac{15}{2} \cdot \frac{\sqrt{2}}{2} + \frac{15}{2} \cdot \frac{i \sqrt{2}}{2} + \frac{15 i \sqrt{3}}{2} (\frac{\sqrt{2}}{2} + \frac{i \sqrt{2}}{2})$

Step 6.3

Apply the distributive property.

$\frac{15}{2} \cdot \frac{\sqrt{2}}{2} + \frac{15}{2} \cdot \frac{i \sqrt{2}}{2} + \frac{15 i \sqrt{3}}{2} \cdot \frac{\sqrt{2}}{2} + \frac{15 i \sqrt{3}}{2} \cdot \frac{i \sqrt{2}}{2}$

Step 7

Simplify terms.

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Step 7.1

Simplify each term.

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Step 7.1.1

Multiply $\frac{15}{2} \cdot \frac{\sqrt{2}}{2}$ .

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Step 7.1.1.1

Multiply $\frac{15}{2}$ by $\frac{\sqrt{2}}{2}$ .

$\frac{15 \sqrt{2}}{2 \cdot 2} + \frac{15}{2} \cdot \frac{i \sqrt{2}}{2} + \frac{15 i \sqrt{3}}{2} \cdot \frac{\sqrt{2}}{2} + \frac{15 i \sqrt{3}}{2} \cdot \frac{i \sqrt{2}}{2}$

Step 7.1.1.2

Multiply $2$ by $2$ .

$\frac{15 \sqrt{2}}{4} + \frac{15}{2} \cdot \frac{i \sqrt{2}}{2} + \frac{15 i \sqrt{3}}{2} \cdot \frac{\sqrt{2}}{2} + \frac{15 i \sqrt{3}}{2} \cdot \frac{i \sqrt{2}}{2}$

Step 7.1.2

Multiply $\frac{15}{2} \cdot \frac{i \sqrt{2}}{2}$ .

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Step 7.1.2.1

Multiply $\frac{15}{2}$ by $\frac{i \sqrt{2}}{2}$ .

$\frac{15 \sqrt{2}}{4} + \frac{15 (i \sqrt{2})}{2 \cdot 2} + \frac{15 i \sqrt{3}}{2} \cdot \frac{\sqrt{2}}{2} + \frac{15 i \sqrt{3}}{2} \cdot \frac{i \sqrt{2}}{2}$

Step 7.1.2.2

Multiply $2$ by $2$ .

$\frac{15 \sqrt{2}}{4} + \frac{15 (i \sqrt{2})}{4} + \frac{15 i \sqrt{3}}{2} \cdot \frac{\sqrt{2}}{2} + \frac{15 i \sqrt{3}}{2} \cdot \frac{i \sqrt{2}}{2}$

Step 7.1.3

Multiply $\frac{15 i \sqrt{3}}{2} \cdot \frac{\sqrt{2}}{2}$ .

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Step 7.1.3.1

Multiply $\frac{15 i \sqrt{3}}{2}$ by $\frac{\sqrt{2}}{2}$ .

$\frac{15 \sqrt{2}}{4} + \frac{15 i \sqrt{2}}{4} + \frac{15 i \sqrt{3} \sqrt{2}}{2 \cdot 2} + \frac{15 i \sqrt{3}}{2} \cdot \frac{i \sqrt{2}}{2}$

Step 7.1.3.2

Combine using the product rule for radicals.

$\frac{15 \sqrt{2}}{4} + \frac{15 i \sqrt{2}}{4} + \frac{15 i \sqrt{2 \cdot 3}}{2 \cdot 2} + \frac{15 i \sqrt{3}}{2} \cdot \frac{i \sqrt{2}}{2}$

Step 7.1.3.3

Multiply $2$ by $3$ .

$\frac{15 \sqrt{2}}{4} + \frac{15 i \sqrt{2}}{4} + \frac{15 i \sqrt{6}}{2 \cdot 2} + \frac{15 i \sqrt{3}}{2} \cdot \frac{i \sqrt{2}}{2}$

Step 7.1.3.4

Multiply $2$ by $2$ .

$\frac{15 \sqrt{2}}{4} + \frac{15 i \sqrt{2}}{4} + \frac{15 i \sqrt{6}}{4} + \frac{15 i \sqrt{3}}{2} \cdot \frac{i \sqrt{2}}{2}$

Step 7.1.4

Multiply $\frac{15 i \sqrt{3}}{2} \cdot \frac{i \sqrt{2}}{2}$ .

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Step 7.1.4.1

Multiply $\frac{15 i \sqrt{3}}{2}$ by $\frac{i \sqrt{2}}{2}$ .

$\frac{15 \sqrt{2}}{4} + \frac{15 i \sqrt{2}}{4} + \frac{15 i \sqrt{6}}{4} + \frac{15 i \sqrt{3} (i \sqrt{2})}{2 \cdot 2}$

Step 7.1.4.2

Raise $i$ to the power of $1$ .

$\frac{15 \sqrt{2}}{4} + \frac{15 i \sqrt{2}}{4} + \frac{15 i \sqrt{6}}{4} + \frac{15 (i^{1} i) \sqrt{3} \sqrt{2}}{2 \cdot 2}$

Step 7.1.4.3

Raise $i$ to the power of $1$ .

$\frac{15 \sqrt{2}}{4} + \frac{15 i \sqrt{2}}{4} + \frac{15 i \sqrt{6}}{4} + \frac{15 (i^{1} i^{1}) \sqrt{3} \sqrt{2}}{2 \cdot 2}$

Step 7.1.4.4

Use the power rule $a^{m} a^{n} = a^{m + n}$ to combine exponents.

$\frac{15 \sqrt{2}}{4} + \frac{15 i \sqrt{2}}{4} + \frac{15 i \sqrt{6}}{4} + \frac{15 i^{1 + 1} \sqrt{3} \sqrt{2}}{2 \cdot 2}$

Step 7.1.4.5

Add $1$ and $1$ .

$\frac{15 \sqrt{2}}{4} + \frac{15 i \sqrt{2}}{4} + \frac{15 i \sqrt{6}}{4} + \frac{15 i^{2} \sqrt{3} \sqrt{2}}{2 \cdot 2}$

Step 7.1.4.6

Combine using the product rule for radicals.

$\frac{15 \sqrt{2}}{4} + \frac{15 i \sqrt{2}}{4} + \frac{15 i \sqrt{6}}{4} + \frac{15 i^{2} \sqrt{2 \cdot 3}}{2 \cdot 2}$

Step 7.1.4.7

Multiply $2$ by $3$ .

$\frac{15 \sqrt{2}}{4} + \frac{15 i \sqrt{2}}{4} + \frac{15 i \sqrt{6}}{4} + \frac{15 i^{2} \sqrt{6}}{2 \cdot 2}$

Step 7.1.4.8

Multiply $2$ by $2$ .

$\frac{15 \sqrt{2}}{4} + \frac{15 i \sqrt{2}}{4} + \frac{15 i \sqrt{6}}{4} + \frac{15 i^{2} \sqrt{6}}{4}$

Step 7.1.5

Simplify the numerator.

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Step 7.1.5.1

Rewrite $i^{2}$ as $- 1$ .

$\frac{15 \sqrt{2}}{4} + \frac{15 i \sqrt{2}}{4} + \frac{15 i \sqrt{6}}{4} + \frac{15 \cdot - 1 \sqrt{6}}{4}$

Step 7.1.5.2

Combine exponents.

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Step 7.1.5.2.1

Factor out negative.

$\frac{15 \sqrt{2}}{4} + \frac{15 i \sqrt{2}}{4} + \frac{15 i \sqrt{6}}{4} + \frac{- (15 \sqrt{6})}{4}$

Step 7.1.5.2.2

Multiply $15$ by $- 1$ .

$\frac{15 \sqrt{2}}{4} + \frac{15 i \sqrt{2}}{4} + \frac{15 i \sqrt{6}}{4} + \frac{- 15 \sqrt{6}}{4}$

Step 7.1.6

Move the negative in front of the fraction.

$\frac{15 \sqrt{2}}{4} + \frac{15 i \sqrt{2}}{4} + \frac{15 i \sqrt{6}}{4} - \frac{15 \sqrt{6}}{4}$

Step 7.2

Reorder $\frac{15 \sqrt{2}}{4} + \frac{15 i \sqrt{2}}{4} + \frac{15 i \sqrt{6}}{4}$ and $- \frac{15 \sqrt{6}}{4}$ .

$- \frac{15 \sqrt{6}}{4} + \frac{15 \sqrt{2}}{4} + \frac{15 i \sqrt{2}}{4} + \frac{15 i \sqrt{6}}{4}$