Final answer to the problem
$\frac{a^2-4ab+4b^2}{4}$
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Step-by-step Solution
Specify the solving method
1
Combine all terms into a single fraction with $4$ as common denominator
$\frac{a^2+4\left(-1\right)ab+4b^2}{4}$
2
Multiply $4$ times $-1$
$\frac{a^2-4ab+4b^2}{4}$
Final answer to the problem
$\frac{a^2-4ab+4b^2}{4}$