Do you mean ?
If so...
Now expand the brackets and see what you can do from there...
Your maths book would be right
As Prove It says (with the amended :
add to both sides
multiply top and bottom of lhs by
multiply top and bottom of rhs by
gives
multiplying both sides by gives
You should be able to complete it from there
hth
btw Prove It, How do you get the horizontal line for divide?
thx
Pro