Solve the inequality
x^3 + 5x^2 >or equal to 4x + 20
Write your answer as an interval or union of intervals.
Please note that the sign is supposed to have a line under it making it 'or equal to.'
The left part is
(x-2)(x+2)(x+5) (I guessed roots from the factors of the free term 20).
It is positive on +infinity and changes sign at each root.
The answer: x in [-5, -2] U [2, +infinity).
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