Question

find the rational roots of the polynomial P(x)= 2x^4-3x^3-9x^2+15X-5, then use this information to solve the following equation 2x^4-3x^3-9x^2+15x-5=0.

Answer 1

x=1 is a root (by trial and errot , subbing factors the constant term into the expression)

so (x-1) is a factor. Then you can divide away.