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f(-2) = -2(-2) + 3
= 4 + 3
= 7
Bayangan dari 3 ~> f(x) = -2x + 3
f(3) = -2(3) + 3
= -6 + 3
= -3
b) Menentukan nilai a ~> f(x) = -2x + 3
f(a) = -2(a) + 3
-7 = -2(a) + 3
-7 = -2a + 3
2a = 3 + 7
2a = 10
a = 5
a. bayangan dari -2 dan 3
f(-2) = -2 x -2 + 3
= 4 + 3
= 7
f(3) = -2 x 3 + 3
= -6 + 3
= -3
b.f(a) = -2a + 3
-7 = -2a + 3
-2a = -7 - 3
-2a = -10
a = -10/-2 = 5