please show the full solution on its factorisation
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2 Answers

by Level 6 User (23.6k points)
x^3-19x+30 =x^3-19x+38-8 =x^3-8-19x+38 =(x^3-2^3)-(19x+38) =(x-2)(x^2+2x+4)-19(x-2) =[(x-2)(x^2+2x-15)] =(x-2)(x+5)(x-3)

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