exam Maths Puzzle Numerical Ability

Simplify the complex fraction and write the term in the lowest terms:
a over a^2-b^2 divided by 1 over a+b plus 1 over a-b

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exam Other Question

Find the equation for the information given. (you can do this in slope intercept form or point intercept form)

Slope of the line is 2 and passes through the point (4,6). When simplifying a radical, is it necessary to take the absolute value of a result to indicate the principal root?