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b. untuk bayangan 2
f(x) = 4x - 2
f(2) = 4(2) - 2
f(2) = 8 - 2
f(2) = 6
untuk bayangan -2
f(x) = 4x -2
f(-2) = 4(-2) -2
f(-2) = -8 -2
f(-2) = -10
untuk bayangan 4
f(x) = 4x -2
f(4)= 4(4) -2
f(4) = 16 -2
f(4) = 14
untuk bayangan -4
f(x) = 4x -2
f(-4) = 4(-4) -2
f(-4) = -16 -2
f(-4) = -18
c. untuk f(p) = 8
f(p) = 4p -2
8 = 4p -2
4p = -2 -8
4p = -10
p = -10/4
p = -2,5