Basic Math Examples

$2 {(5 - 2)}^{3} - 15 \div 3 + 7$

Step 1

Find the common denominator.

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Step 1.1

Write $2 {(5 - 2)}^{3}$ as a fraction with denominator $1$ .

$\frac{2 {(5 - 2)}^{3}}{1} - 15 \div 3 + 7$

Step 1.2

Multiply $\frac{2 {(5 - 2)}^{3}}{1}$ by $\frac{3}{3}$ .

$\frac{2 {(5 - 2)}^{3}}{1} \cdot \frac{3}{3} - 15 \div 3 + 7$

Step 1.3

Multiply $\frac{2 {(5 - 2)}^{3}}{1}$ by $\frac{3}{3}$ .

$\frac{2 {(5 - 2)}^{3} \cdot 3}{3} - 15 \div 3 + 7$

Step 1.4

Write $7$ as a fraction with denominator $1$ .

$\frac{2 {(5 - 2)}^{3} \cdot 3}{3} - 15 \div 3 + \frac{7}{1}$

Step 1.5

Multiply $\frac{7}{1}$ by $\frac{3}{3}$ .

$\frac{2 {(5 - 2)}^{3} \cdot 3}{3} - 15 \div 3 + \frac{7}{1} \cdot \frac{3}{3}$

Step 1.6

Multiply $\frac{7}{1}$ by $\frac{3}{3}$ .

$\frac{2 {(5 - 2)}^{3} \cdot 3}{3} - 15 \div 3 + \frac{7 \cdot 3}{3}$

Step 2

Combine the numerators over the common denominator.

$\frac{2 {(5 - 2)}^{3} \cdot 3 - 15 + 7 \cdot 3}{3}$

Step 3

Simplify each term.

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Step 3.1

Subtract $2$ from $5$ .

$\frac{2 \cdot 3^{3} \cdot 3 - 15 + 7 \cdot 3}{3}$

Step 3.2

Multiply $3^{3}$ by $3$ by adding the exponents.

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Step 3.2.1

Move $3$ .

$\frac{2 \cdot (3 \cdot 3^{3}) - 15 + 7 \cdot 3}{3}$

Step 3.2.2

Multiply $3$ by $3^{3}$ .

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Step 3.2.2.1

Raise $3$ to the power of $1$ .

$\frac{2 \cdot (3^{1} \cdot 3^{3}) - 15 + 7 \cdot 3}{3}$

Step 3.2.2.2

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

$\frac{2 \cdot 3^{1 + 3} - 15 + 7 \cdot 3}{3}$

Step 3.2.3

Add $1$ and $3$ .

$\frac{2 \cdot 3^{4} - 15 + 7 \cdot 3}{3}$

Step 3.3

Raise $3$ to the power of $4$ .

$\frac{2 \cdot 81 - 15 + 7 \cdot 3}{3}$

Step 3.4

Multiply $2$ by $81$ .

$\frac{162 - 15 + 7 \cdot 3}{3}$

Step 3.5

Multiply $7$ by $3$ .

$\frac{162 - 15 + 21}{3}$

Step 4

Simplify the expression.

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Step 4.1

Subtract $15$ from $162$ .

$\frac{147 + 21}{3}$

Step 4.2

Add $147$ and $21$ .

$\frac{168}{3}$

Step 4.3

Divide $168$ by $3$ .

$56$