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\frac{2}{a}-2
Calculate the square root of 4 and get 2.
\frac{2}{a}-\frac{2a}{a}
To add or subtract expressions, expand them to make their denominators the same. Multiply 2 times \frac{a}{a}.
\frac{2-2a}{a}
Since \frac{2}{a} and \frac{2a}{a} have the same denominator, subtract them by subtracting their numerators.