If a is one of the root of the equation 4x^2+2x-1=0. Then find the other root

Question

If a is one of the root of the equation 4x^2+2x-1=0. Then find the other root enter image description here

MY WORK: enter image description here

I tried using the sum and product of rules formula to find b in terms of a but I didnt get the answer according to the options given.

See https://math.stackexchange.com/questions/550052/proving-the-second-root-of-a-quadratic-equation — lab bhattacharjee, Feb 11 '18 at 16:22

score 0 · Answer 1 · answered Feb 11 '18 at 16:24

0

It's trivially $4a^3 - 3a$$~~~~~$

answered Feb 11 '18 at 16:24

Enrico M.

1 Answers1