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B. g(x) . h(x) = 2x . (x² + 2) = 2x³+4x
C. (f h)(x) . (g h)(x) = f(x).h(x) . g(x).h(x)
= (3x + 5)(x² + 2) . (2x)(x² + 2)
= (3x³+5x²+6x+10) . (2x³+4x)
= 6x(pangkat6)+12x⁴+10x(pangkat5)+20x³+12x⁴+24x+20x³+40x
= 6x(pangkat6) + 10x(pangkat5) + 24x⁴ + 40x³ + 64x
D. sama seperti C
Sekian terimakasih
Semoga bermanfaat:))