Question

Seja a função f(x)=3x²-5x+7 calcule o valor de f(-2)-f (3):

a) 10
b) 12
c) 14
d) 16
e) 18

Answer 1

 f(x)=3x²-5x+7 calcule o valor de f(-2)-f (3):

f(-2) = 3.(-2)² - 5.(-2) + 7
f(-2) = 3.4 + 10 + 7
f(-2) = 12 + 17
f(-2) = 29

f(3) = 3.3² - 5.3 + 7
f(3) = 3.9 - 15 + 7
f(3) = 27 - 15 + 7
f(3) = 12 + 7
f(3) = 19

f(-2) - f(3) = 29 - 19 = 10

Resp.: letra A (10)