exam Maths Puzzle Numerical Ability

Tutor could you please help me to simplify the following?

12x^2+4x-1/2x+1

and

x^2+3x-4/x^2-x-20

Thank You

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exam Other Question
From a worksheet.
An investment advisor invested $25,000 into two simple interest accounts. One investment earned 12.5% annual simple interest; the other investment earned 13.9% Find the area of the region between two concentric circles with radii 9 and 6.