Sunday, December 21, 2014

What is the solution of : log(3x+5) (9x*x + 8*x +2) > 2?

We have to solve: log(3x + 5) (9x*x + 8*x +2) >
2


log(3x + 5) (9x*x + 8*x +2) >
2


=> 9x*x + 8*x +2 > (3x +
5)^2


=> 9x^2 + 8x + 2 > 9x^2 + 30x +
25


=> 8x - 30x > 25 -
2


=> -22x >
23


=> x <
-23/22


But the base of the logarithm has to be greater than
0


=> 3x + 5 >
0


=> x >
-5/3


The solution of the inequality is -5/3
< x < -23/22

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