Question

5a²+3ab , para a = -3 e b= 4

Answer 1

a = - 3; b = 4

5a² + 3ab

= 5(-3)² + 3.(-3).4
= 5.9 + 3. (-12)
= 45 - 36
= 9

Answer 2

$5.(-3) ^{2}+3.(-3).4= 5.9+(-9).4= 45-36=9$