exam Maths Puzzle Numerical Ability

Explain how the graph of y = f(x + h) can be obtained from the graph of y = f(x) when h > 0 , and also when h < 0.

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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 How do I prove ABCD is a quadrilateral?