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Find (x^3-12*x^2-42)*(x^2+x-3)

Solution:
Your problem `->` (x^3-12*x^2-42)*(x^2+x-3)


(x3-12x2-42) (x2+x-3)
= x3(x2+x-3) -12x2(x2+x-3) -42(x2+x-3)
= x5 + x4 - 3x3 - 12x4 - 12x3 + 36x2 - 42x2 - 42x + 126
= x5 + x4 - 3x3 - 12x4 - 12x3 + 36x2 - 42x2 - 42x + 126
= x5 + x4 - 12x4 - 3x3 - 12x3 + 36x2 - 42x2 - 42x + 126
= x5 - 11x4 - 15x3 - 6x2 - 42x + 126





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