Question

2x^3+18x^2-18x-162 = 2(x+k)(x-k)(x+9) in the factored form what is the value for k

Answer 1

Note that the last term will be equal to -18k^2, so we write the equation: -18k^2=162. Dividing by 18, we see that k^2=9, so k=3 or -3.