SOLUTION: factorise x cubed + 2x squared - 2x - 4 and find the exact value of each of the solutions of the equation x cubed + 2x squared - 2x - 4 = 0

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Question 46233: factorise x cubed + 2x squared - 2x - 4 and find the exact value of each of the solutions of the equation x cubed + 2x squared - 2x - 4 = 0
Answer by gsmani_iyer(201) About Me  (Show Source):
You can put this solution on YOUR website!

x%5E3%2B2x%5E2-2x-4 = x%5E2%28x%2B2%29-2%28x%2B2%29 = 0
= %28x%2B2%29%28x%5E2-2%29 = 0. So either (x+2) or x%5E2-2 is equal to 0.
If (x+2) = 0, then x = -2;
If x%5E2-2 = 0, then x = sqrt%282%29;
The solution set = {-2, sqrt%282%29}. I hope this is clear to you.
gsm