Answer
$2a+4$
Work Step by Step
Divide $2a$ to each term of the dividend to have:
$\require{cancel}
\\=\dfrac{4a^2}{2a} + \dfrac{8a}{2a}
\\=\dfrac{\cancel{4a^2}2a}{\cancel{2a}} + \dfrac{\cancel{8a}4}{\cancel{2a}}
\\=2a + 4$
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