Question

x^3+3x^2>4x

find x

Answer 1

if you've paid attention, you'll see this is NOT the previous question

Answer 2

the previous one is x^2+3x^2>4x, which is miss typed

Answer 3

rewrite the inequality

\[x^3 + 3x^2 - 4x > 0\]
simplify by taking the HCF

\[x(x^2 + 3x - 4) > 0\]

factorise the brackets...

they you will have 2 values of x... as solutions... you just need to test where the function is positive...(> 0)