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b sama juga caranya. didapat x^5 - x^4 - 7x³+3x²-8x+40
m(m2-3m+4) + 5(m2-3m+4)
m3 - 3m2 + 4m + 5m2 - 15m + 20
m3 - 3m2 + 5m2 + 4m - 15m + 20
m3 + 2m2 - 11m + 20
B. (x3-x2+x-5)(x2-8)
x2(x3 -x2 + x - 5) - 8(x3 - x2 + x - 5)
x6 - x4 + x3 - 5x2 - 8x3 + 8x2 - 8x + 40
x6 - x4 + x3 - 8x3 - 5x2 + 8x2 - 8x + 40
x6 - x4 + 7x3 + 3x2 - 8x + 40
Semoga bermanfaat, dan benar :)