Question

help please Solve this!!!

Answer 1

comes down to x^3+27x^2-9x-7 <= 0

need to solve the cubic equation from here, i'll show you how

Answer 2

this can't be solved by hand so we need to use a cubic equation calculator

Answer 3

how did you arrive at this?

Answer 4

you have started the question with the right approach...
next factorise the equation in the bracket to a simpler form using the quadratic formula
then you will have an inequality of the form x(x-a)(x-b) <7
then you can sketch a rough graph using the x intercepts to find range of x