Diketahui fungsi f(x) = ax + b, f(-1) = 1 dan f(1) = 5, maka nilai f(3) adalah
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Jawaban:
f(3) = 9
Penjelasan:
f(x) = ax + b
f(-1) = -a + b = 1 .......... persamaan 1
f(1) = a + b = 5 ......... persamaan 2
________-
-2a = -4
a = 2
substitusikan a = 2 ke persamaan 2
a + b = 5
2 + b = 5
b = 5 - 2
b = 3
f(x) = 2x + 3
f(3) = 2(3) + 3
= 6 + 3
= 9
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