Question

Se f(x)= x2 + x, então quanto vale f(3)?

Answer 1

$f(x) = x {}^{2} + x$

$\boxed{x = 3}$

$f(3) = 3 {}^{2} + 3$

$f(3) = 9 + 3$

$\boxed{f(3) = 12}$

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