Precalculus Examples

$\frac{1}{x^{2}} + 3$

Step 1

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

$\frac{1}{x^{2}} + \frac{3 x^{2}}{x^{2}}$

Step 2

Combine the numerators over the common denominator.

$\frac{1 + 3 x^{2}}{x^{2}}$