book Maths Puzzle Numerical Ability

Simplify the rational expression

(x-5/x^2+2x-3)-(x-1/x^2+6x+9

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book Other Question

If f(x)=x^2-3x+5, find f(1)-f(4) A storeowner buys a quality of balls for $600. If they had each cost $0.25 less, shewould have had 10 more for the same money. How much did she pay for each ball?