Question

Pleaseeee help, Grade 12!

If x^3 - 4x^2 +kx =0

what value of k would result in two equal roots?

Answer 1

x(x^2-4x+k)=0
16-4k=0 so k=4

Answer 2

thank you so much

Answer 3

np

Answer 4

sorry where did 16 -4k come from?

Answer 5

b-sqrt(b^2-4ac)... that formula. so b^2-4ac=4^2-4k.
as you can see, you can factor out an x to get a quadratic equation, use the quadratic formula to solve that equation and there you go :)

Answer 6

oooo thanks!