exam Maths Puzzle Numerical Ability

simplify: x^2+2x+1-y^2/(x+1)^2+2y(x+1)+y^2

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exam Other Question

Find a value for k so that 9m squared - kn squared will have the factors 3m + 7n and 3m - 7n 3 logb x = logb 64

I do not understand this problem. I have a quiz coming up Wednesday. I need someone to help me with this problem. My brain hurts. Can someone please help me?