Question 1003611
Please help me to solve the following: 
Solve and put answer into interval notation... 
−4x^3 + 55x^2 − 207x + 126 > 0 
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I graphed it and found Real roots at x = 3/4, x = 6 and x = 7
and x = 7
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{{{graph(400,400,-10,10,-10,10,-4x^3+55x^2-207x+126)}}}
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The graph is above the x-axis in the interval (-oo,3/4)U(6,7)
Cheers
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