exam Maths Puzzle Numerical Ability

We are just starting Inverse matrices and I got it until I came to this problem. Will you show me how to solve it?

A^-1=matrix (2 2)
x+1, x+2
x+3, x+4

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exam Other Question

We are familiar with the identity (a+b)(a-b)=a^2-b^2. If A and B are n*n matrices, do we always have (A+B)(A-B)=A^2-B^2? If so, prove it. If not, give a counterexample, and give a Ching, Alex, Ellen and Ashley are playing in a local golf tournament. For the first two days of the tournament both of Ching's sores were under -2. Alex had scores under par, or z