Question

a²+3a para a=-½? Não consigo calcular o valor das expressões

Answer 1

(-1/2)² +3(-1/2)=

1/4 - 3/2= (Cálculo do MMC)

3/12 - 18/12=

-15/12=

-5/4

Answer 2

$Hi \\ \\ a\²+3a~~~~---\ \textgreater \ a=- \frac{1}{2} \\ \\ (- \frac{1}{2})\²+3(- \frac{1}{2}) \\ \\ \underbrace{\frac{1}{4}- \frac{3}{2} }_{- \frac{5}{4} } \\ \\ \\ \therefore~\boxed{\boxed{-\frac{5}{4}}} \\ \\ ================================== \\~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ Espero~ter~ajudado!!$