Question

sabendo que a =1/2e b = determine o valor numerico de 5a-a²

Answer 1

a =1/2

5a-a²

$5 (\frac{1}{2} )- ( { \frac{1}{2} })^{2}$
$( \frac{5}{2} ) - ( \frac{1}{4} )$
$\frac{10 - 1}{4} = \frac{9}{4}$