exam Maths Puzzle Numerical Ability

my question says: below are some trinomials for you to factor.

5x to the second + 35x + 60=


PLEASE!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!

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exam Other Question

Add or subtract as indicated. (finding LCD)

b/b-1 + 2b/b^2-1

a-1/a+1 + a+1/a-1

4/a-5 - 1/5-a

It would be cool if someone could explain that to me!
x/2-41/3=-21/4