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f(a) = 2a + 5
23 = 2a + 5
18 = 2a
a = 9
a. f(x) = 2x + 5,, utk byangan dari 3 dan -2, mka kita gantii x dg byangan tsb ..
f(3) = 2.3 + 5 = 11
f(-2) = 2.-2 + 5 = 1
f(x) = 2x + 5
f(3) = 11
f(x) = 2x + 5
f(-2) = 1
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b).
f(x) = 2x + 5
f(a) = 23
23 = 2a + 5
2a = 23 - 5
2a = 18
a = 9