Question

Sendo A= 3x²+5x-6 determine o valor de A.

Answer 1

a) x = -2
A = 3.(-2)^2 + 5.(-2) -6
A = 3.4 -10 -6
A = 12 - 16
A = -4

b) x = 2^(-1)
A = 3.(2^(-1))^2 + 5.2^(-1) - 6
A = 3.1/4 + 5.1/2 - 6
A = 3/4 + 5/2 - 6
A = 3/4 + 10/4 - 24/4
A = (13 - 24)/4
A = -11/4
A = -2,75