Question

can anyone solve this one, x^4-x^3-42x^2=0, so far i have x^2(x^2-x-42)=0

Answer 1

good, so x=0 is one solution. Now just solve the quadratic using the quadratic formula

Answer 2

(x^2)(x^2-x-42) = 0
(x^2)(x+6)(x-7) = 0
x = 0, 0, -6, 7
x = 0, -6, 7

Answer 3

oh how nice it even factors!

Answer 4

x=0,-6,7

Answer 5

thanks!!