You can put this solution on YOUR website! 4x^2 - 5x - 6 <= 0
factor the polynomial
(4x+3)*(x-2) = 0
there are 2 cases to consider
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1) 4x+3 = 0
4x = -3
x = -3/4
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2) x - 2 = 0
x = 2
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solution is (-3/4) <= x <= 2