To add or subtract expressions, expand them to make their denominators the same. Least common multiple of $b$ and $a$ is $ab$. Multiply $\frac{a}{b}$ times $\frac{a}{a}$. Multiply $\frac{b\times 2}{a}$ times $\frac{b}{b}$.
To add or subtract expressions, expand them to make their denominators the same. Least common multiple of $ab$ and $a$ is $ab$. Multiply $\frac{b}{a}$ times $\frac{b}{b}$.
To add or subtract expressions, expand them to make their denominators the same. Least common multiple of $ab$ and $b$ is $ab$. Multiply $\frac{a\times 2}{b}$ times $\frac{a}{a}$.
$$\frac{a^{2}+b^{2}}{ab}+\frac{a\times 2a}{ab}$$
Since $\frac{a^{2}+b^{2}}{ab}$ and $\frac{a\times 2a}{ab}$ have the same denominator, add them by adding their numerators.
$$\frac{a^{2}+b^{2}+a\times 2a}{ab}$$
Do the multiplications in $a^{2}+b^{2}+a\times 2a$.
