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f(-5)⇒ -5a + b = 30 _
10a = - 30
a = -3
subtitusikan
b = 0 - 5a
= 0 - 5(-3)
= 15
nilai dari
b+ 3a² = 15 + 3(-3)²
= 15 + 3(9)
= 15 + 27
= 42