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f(3) = 2x + 5
=2(3)+5
= 6+5
= 11
f(-2) = 2x +5
= 2(-2) + 5
= -4+5
= 1
jawaban soal B
f(a) ⇒ 2a + 5 = 23
2a = 23-5
2a = 18
a = 18/2
a = 9