mohon bantuanya yaa.....

f(x) = 2x
g(x) = x + 1
fog(x) = f(g(x))
          = f(x + 1)
          = 2(x + 1)
          = 2x + 2

fog(x) = {(0,2) (1,4) (2, 6) (3,8) (4,10)}
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f(x) = -2x + 5
f(x + 2) = -2(x + 2) + 5
f(x + 2) = -2x - 4 + 5
f(x + 2) = -2x + 1

f(x - 4) = 5x + 3
f(x) = 5(x + 4) + 3
f(x) = 5x + 20 + 3
f(x) = 5x + 23