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Verified answer
F(x) = 4x + 9Maka
f(-1) = a
f(-1) = 4(-1) + 9
f(-1) = -4 + 9
f(-1) = 5
a = 5
Nilai b :
f(b) = - 3
-3 = 4x + 9
-3 - 9 = 4x
-12 = 4x
-12/4 = x
-3 = x
Jadi nilai b = -3
Maka:
a + b = 5 + (-3) = 5 - 3 = 2