exam Maths Puzzle Numerical Ability

Prove a^3-64/a^2-16=a^2+4a+16/a+4

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exam Other Question

Explain the following in your own words: (a + b)^2 is not equal to a^2 + b^2. Give a numerical example to illustrate this. How would you find 2 positive numbers that differ by 2 and have a product of 20? I dont know how to set up the equation in this instance.