Question 1022092
Look at the numerator first
it is (x^2+1)*(1/2 sqrt (x))- sqrt(x)*2x
Now put this over a common denominator of 2 sqrt(x).  That means multiplying the second term by 2(sqrt(x)), and that will be 4x^2.
The common denominator of 2 sqrt (x) goes into the denominator with (x^2+1)^2.
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Now, the numerator is (x^2+1)-4x^2, the common denominator now part of the answer denominator.
That is 1-3x^2.