# Doubt from quadratic equations

**Hari_Shankar**#2

Hint: Look at P(x)=\dfrac{ax^4}{4}+\dfrac{bx^3}{3}+\dfrac{cx^2}{2}+dx

Note that P'(x) equals the given polynomial.

**Sandeep_2020**#5

i think you wrote something wrong fx should have 2 roots and f'x should have 1 root..