Basic Math Examples

$\frac{5}{3 y} - \frac{4}{y^{2}}$

Step 1

To write $\frac{5}{3 y}$ as a fraction with a common denominator, multiply by $\frac{y}{y}$ .

$\frac{5}{3 y} \cdot \frac{y}{y} - \frac{4}{y^{2}}$

Step 2

To write $- \frac{4}{y^{2}}$ as a fraction with a common denominator, multiply by $\frac{3}{3}$ .

$\frac{5}{3 y} \cdot \frac{y}{y} - \frac{4}{y^{2}} \cdot \frac{3}{3}$

Step 3

Write each expression with a common denominator of $3 y^{2}$ , by multiplying each by an appropriate factor of $1$ .

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Step 3.1

Multiply $\frac{5}{3 y}$ by $\frac{y}{y}$ .

$\frac{5 y}{3 y \cdot y} - \frac{4}{y^{2}} \cdot \frac{3}{3}$

Step 3.2

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

$\frac{5 y}{3 (y^{1} y)} - \frac{4}{y^{2}} \cdot \frac{3}{3}$

Step 3.3

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

$\frac{5 y}{3 (y^{1} y^{1})} - \frac{4}{y^{2}} \cdot \frac{3}{3}$

Step 3.4

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

$\frac{5 y}{3 y^{1 + 1}} - \frac{4}{y^{2}} \cdot \frac{3}{3}$

Step 3.5

Add $1$ and $1$ .

$\frac{5 y}{3 y^{2}} - \frac{4}{y^{2}} \cdot \frac{3}{3}$

Step 3.6

Multiply $\frac{4}{y^{2}}$ by $\frac{3}{3}$ .

$\frac{5 y}{3 y^{2}} - \frac{4 \cdot 3}{y^{2} \cdot 3}$

Step 3.7

Reorder the factors of $y^{2} \cdot 3$ .

$\frac{5 y}{3 y^{2}} - \frac{4 \cdot 3}{3 y^{2}}$

Step 4

Combine the numerators over the common denominator.

$\frac{5 y - 4 \cdot 3}{3 y^{2}}$

Step 5

Multiply $- 4$ by $3$ .

$\frac{5 y - 12}{3 y^{2}}$