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\frac{a}{4}+\frac{2}{a}
Calculate 2 to the power of 2 and get 4.
\frac{aa}{4a}+\frac{2\times 4}{4a}
To add or subtract expressions, expand them to make their denominators the same. Least common multiple of 4 and a is 4a. Multiply \frac{a}{4} times \frac{a}{a}. Multiply \frac{2}{a} times \frac{4}{4}.
\frac{aa+2\times 4}{4a}
Since \frac{aa}{4a} and \frac{2\times 4}{4a} have the same denominator, add them by adding their numerators.
\frac{a^{2}+8}{4a}
Do the multiplications in aa+2\times 4.