Question

Dada a f=IR -IR tal que f=(×)=2×-8
Calcule:f (3)=?
F (×)=(-2)=?

Answer 1

Dada a f=IR -IR tal que
=(×)=2×-8
Calcule:f (3)=?

f(x) = 2x - 8
f(3) = 2(3) - 8
f(3) = 6 - 8
f(3) = - 2


F (×)=(-2)

f(x) = 2x - 8
  - 2= 2x - 8
- 2 + 8 = 2x
       6 = 2x   mesmo que
2x = 6
x = 6/2
x = 3