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f(3) = 2(3)³ + 4(3)² - 18
= 2(27) + 4(9) - 18
= 54 + 36 - 18
= 72
bagian b
f(-4) = (-4)⁴ + 3(-4)³ - (-4)² + 7(-4) + 25
= 256 + 3(-64) - 16 - 28 + 25
= 256 - 192 - 19
= 45