Answer
$= \frac{11b^{2}-14a^{2}}{a^{2}b^{2}}$
Work Step by Step
1) Multiply a fraction with the other denominator to obtain a common denominator between the two fractions. In this case, we multiply the first fraction by $b^{2}/b^{2}$ and the second fraction by $a^{2}/a^{2}$ to obtain a common denominator of $a^{2}b^{2}$
2) Subtract
$= \frac{11}{a^{2}} - \frac{14}{b^{2}}$
$= \frac{11b^{2}}{a^{2}b^{2}} - \frac{14a^{2}}{a^{2}b^{2}}$
$= \frac{11b^{2}-14a^{2}}{a^{2}b^{2}}$
