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f(a) ⇒ 2a = 128
a = 128/2
a = 64
jawaban soal nomer 2
f(-2) ⇒ -2p + q = 14
f(3 ) ⇒ 3p + q = -1 _
-5p = 15
p = -3
subtitusikan
3p + q = -1
q = - 1 - 3p
q = -1 -3(-3)
q = -1 + 9
q = 8
nilai dari
f(-4) = px + q
= -3x + 8
= -3(-4) + 8
= 12+8
= 20