Question

Solve the equation 2x^3-x^2-18x+9=0 if two roots are equal in magnitude but opposite in sign​

Answer 1

Answer:

2x³-x²-18x+9=0

x³+x³-x²-18x+9=0

x³+x²(x-1)-9(x-1)=0

x³+(x²-9)(x-1)=0