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What is the value of the coefficient 2x^3+18x^2-18x-162=2(x+k)(x-k)(x+9)
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What is the value of the coefficient 2x^3+18x^2-18x-162=2(x+k)(x-k)(x+9)

User Bojan Petkovic
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The polynomial

2x^3+18x^2-18x-162=(2x^3+18x^2)-(18x+162)=

=2x^2(x+9)-18(x+9)=2(x+9)(x^2-9)=2(x+9)(x+3)(x-3).
Then k=3.

User Joncodo
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