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f(x) = (6 - x)(2x + 4)
f(x) = 12x + 24 - 2x² - 4x
f(x) = -2x² + 8x + 24
Luas maksimum :
= (-(b² - 4ac)) : (4a)
= (-(8² - 4(-2)(24))) : (4)(-2)
= (-(64 + 192 )) : (-8)
= (-256) : (-8)
= 32 cm²
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