Question

Sendo F(x) = x² + 3x - 5 e G(x) = 3x - 8,calcule: 2 F(-2) + 3 G(3) - 8.

Answer 1

f(x)=x^2+3x-5
g(x)=3x-8
f(-2)=(-2)^2+3.(-2)-5
f(-2)=4-6-5
f(-2)=4-11
f(-2)=-7
g(3)=3.3-8
g(3)=9-8
g(3)=1
2f(-2)+3g(3)-8
2.(-7)+3.(1)-8
-14+3-8
-11-8
-19

Answer 2

f(-2) = (-2)"2 + 3(-2) - 5 ==> 4 - 6 - 5 ==> - 7

g(3) = 3(3) - 8 ==> 9 - 8 ==> 1

=============================

2f(-2) + 3g(3) - 8

2(-7) +3(1) - 8

- 14 + 3 - 8

- 19