Question

Given the polynomial 2x^3 + 18x^2 - 18x - 162, what is the value of the coefficient 'k' in the factored form?

2x^3 + 18x^2 - 18x - 162 = 2(x + k)(x - k)(x +9)

k= ____________

Answer 1

compare the constants
2*k*(-k)*9 = -162
find k from here :)

Answer 2

its like plugging in x=0 too :)