exam Maths Puzzle Numerical Ability

anybody know how to simplify this expression?

16x^2 + 8x - 4 OVER 4

or: 16x^2 + 8x - 4 / 4

thanks for your help. I NEED it. :)

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exam Other Question
-2a(-3c)+(-6y)(6r) I am trying to review for a final and would like to get help with A &B:

a. y= (10^x-10^-x)/ (2)
b. y= (e^x +e^-x) / (2)