Question

a2 + 4a, para a = 2/3

Answer 1

$2a + 4a = \\ \\ 2 \times \frac{2}{3} + 4 \times \frac{2}{3} = \\ \\ \frac{4}{3} + \frac{8}{3} = \frac{4 + 8}{3} = \frac{12}{3} = 4$

Answer 2

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