Question

Calcule o valor da expresão

$\frac{1}{4} . x^{2} \frac{4}{5} + \frac{2}{5} x^{3} = \frac{7}{5}$

Answer 1

$\frac{1}{4} x^{2} \frac{4}{5} + \frac{2}{5} x^{3}= \frac{7}{5}$
$\frac{1}{5} x^{2} + \frac{2}{5} x^{3}= \frac{7}{5}= x^{2} +2 x^{3} =7= 2 x^{3} + x^{2} -7=0$