Basic Math Examples

$21 a^{3} - 14 a \div (- 7)$

Step 1

Rewrite the division as a fraction.

$21 a^{3} - \frac{14 a}{- 7}$

Step 2

Cancel the common factor of $14$ and $- 7$ .

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Step 2.1

Factor $7$ out of $14 a$ .

$21 a^{3} - \frac{7 (2 a)}{- 7}$

Step 2.2

Move the negative one from the denominator of $\frac{2 a}{- 1}$ .

$21 a^{3} - (- 1 \cdot (2 a))$

Step 3

Rewrite $- 1 \cdot (2 a)$ as $- (2 a)$ .

$21 a^{3} - - (2 a)$

Step 4

Multiply $2$ by $- 1$ .

$21 a^{3} - (- 2 a)$

Step 5

Multiply $- 2$ by $- 1$ .

$21 a^{3} + 2 a$