Just have a few questions, I have already attempted them but am having problems on how to square the fractions, therefore my final answers are not correct. Someone please take me through it step by step, especially the squaring fractions..

Co-efficient of x is 1:

1) x^2 - 3x - 5 = 0 ( How to square 3 / 2 )

Co-efficient of x more than 1:

1) 15 - 6 x - 2x^2

2) 4x - x = 8

3) 5x^2 + 8x -2 = 0

Thanks in advance.