Question

x3-x2-17x-15 factorise

Answer 1

Answer:

x^3-x^2-17x-15

suppose value of x as minus one

f(-1)= (-1)^3-(- 1)^2-17*(-1 )-15

f(-1)= -1-1+17-15

f(-1)=-2+2

f(-1)=0

(-1) is a proper root of this factorisation

so, 0^3-0^2-17*0-15

=0-0-0-15

= -15