exam Maths Puzzle Numerical Ability

Let f(x,y)=x^2-xy. Determine a simplified expression for f(x,x-y).

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a-1 a+1
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a+1 a-1 Jonah's speed on his drive to work in the morning averages 20 miles per hour faster than his speed on the return trip in the evening. It takes him 1/4 hour to get to work and 1/2