exam Maths Puzzle Numerical Ability

Simplify: y(squared)+y-20/y(squared)-2y-8. Assume that the denominator is not equal to 0.

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I am having a serious problem figuring out this problem. Can someone please help me?
The problem is multiply (4b+1/2)(8b-3/4) Useing the PEMEDS expesssion, (Please, excuse, my dear, aunt sally)

Simplify

1. 2+3*5^2-7

2. 6+3[(12/4)+5]

3. (4/2)+4(5-2)^2

4. -8-81/9*2^2+7