SOLUTION: what is the solution of the inequality of x^2 +4x ≥ 21

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Question 935801: what is the solution of the inequality of x^2 +4x ≥ 21
Answer by josgarithmetic(39613) About Me  (Show Source):
You can put this solution on YOUR website!
x%5E2%2B4x-21%3E=0
%28x-3%29%28x%2B7%29%3E=0

Critical values are -7 and 3. Test the three intervals or use knowledge about equation and graph of a parabola. Solution is x%3C=-7 AND x%3E=3.