Question

3a² -b² (para a= -2 e b= -7)

Answer 1

3a² -b² (para a= -2 e b= -7)

3×(-2)ao quadrado -(-7)ao quadrado=

3×4-49=

12-49=

-37

Answer 2

$\large\boxed{\boxed{\boxed{{Ol\'a}}}}}$

$3a^2-b^2$

Para a = —2 e b = —7

Então:

$3.(-2)^2-(-7)^2$

$3.4-49$

$12-49$

$-37$

$\underline{Espero\:ter\:Ajudado}$