Question 470845: Solve (x+20)(x-19)(x+19)>0 The solution set is {x|_}
Answer by lwsshak3(11628)   (Show Source):
You can put this solution on YOUR website! Solve (x+20)(x-19)(x+19)>0
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f(x)= (x+20)(x-19)(x+19)>0
show roots or zeros on number line, then determine sign of f(x) within intervals
-∞..................-20...........-19............19............∞ (number line)
(x+20)......-.......0......+.......0......+......0.....+.....∞
(x+19)......-.......0......-.......0.......+......0....+.....∞
(x-19)......-........0......-.......0.......-......0.....+....∞
f(x)......... .-.......0......+.......0.......-......0.....+.....∞
solution: (-20,-19) U (19,∞)
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