Need help with some questions:

1) Expand and simplify:

a)

b)

2) Simplify fully, expressing each answer with a rational denominator:

i.

ii.

3) Solve simultaneously for x and y given the equations:

4) The sum of 2 numbers is 23 and the product is 112.

i. Write down a pair of simultaneous equations to represent the information.

ii. Find the two numbers