SOLUTION: If y=x^2-x-12, find the range of the value of x for which y =>0.

Algebra ->  Inequalities -> SOLUTION: If y=x^2-x-12, find the range of the value of x for which y =>0.      Log On


   

Question 1151452: If y=x^2-x-12, find the range of the value of x for which y =>0.
Answer by MathLover1(20849) About Me  (Show Source):
You can put this solution on YOUR website!
If y=x%5E2-x-12, find the range of the value of x+for which y%3E=0
x%5E2-x-12%3E=0..........solve for x
x%5E2-x-12%3E=0.......factor
x%5E2%2B3x-4x-12%3E=0
%28x%5E2%2B3x%29-%284x-12%29%3E=0
x%28x%2B3%29-4%28x-3%29%3E=0
%28x+-+4%29%28x+%2B+3%29%3E=0
solutions:
%28x+-+4%29%3E=0 =>x%3E=4
%28x+%2B+3%29%3E=0 =>x%3C=-3
interval:
(-infinity,-3] U [4,infinity)



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