Question

Dada a função f (x) = 8x + 18 calcule
A) f(0) - f(3)
B) f(5) - f (10)
C) f(7) + f(-3)
D) f(2) + f(3)

Answer 1

a) f(0) - f(3) = 18 - 42 = -24
f(0) = 8(0)+18
      = 0+18
      = 18

f(3) = 8(3)+18
      = 24+18
      = 42

b) f(5) - f(10) = 58 - 98 = -40
f(5) = 8(5)+18
      = 40+18
      = 58
f(10) = 8(10)+18
        = 80+18
        = 98

c) f(7) + f(-3) = 74 - 6 = 68
f(7) = 8(7)+18
      =  56 +18
      = 74
f(-3) = 8(-3)+18
        = -24 + 18
        = -6

d) f(2)+ f(3) = 34+42 = 76
f(2) = 8(2)+18
      = 16+18
      =  34
f(3) = 8(3)+18
      = 24+18
      = 42