i am not sure how to solve this . Thanks for helping .

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- September 2nd 2009, 06:27 AMthereddevilsinequalities

i am not sure how to solve this . Thanks for helping . - September 2nd 2009, 07:33 AMSoroban
Hello, thereddevils!

Quote:

i am not sure how to solve this . Thanks for helping .

. . Hence, is also positive.

Multiply by 4: .

Take the square root: .

And we have: .

We have: . . . . an up-opening parabola.

. . It is positive on the "outside" of its -intercepts.

So we solve: .

. . Quadratic Formula: .

Hence, is positive for: .

. . Therefore: .

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. .*We're golden!*