Simplify the expression fraction with numerator of the square root of negative twenty five and denominator of the quantity five minus two times i plus the quantity one minus three times i

If I understood you correctly this is the expression we need to simplify:

You should keep in mind that square root of -1 is equal to i. i is called the imaginary unit. 
Let us simplify this expression:

To simplify this further we can multiply numerator and denominator with 6+5i to elimante imaginary numbers from denominator.

Bc equals mb that should be your answer