exam Maths Puzzle Numerical Ability

simplify: (x^-2)^n-2/x^4

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exam Other Question

Please help me simplfy this complex rational expression:

1/y-4 + 1/y+5

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6/y+5 + 2/y-4 I need to evaluate the function at the given expression, I need to find f (k-1) when f (x)=3x2-5x-4