exam Maths Puzzle Numerical Ability

let f(x)=4-x^ and g(x)=2-x. Find f(x)-g(x)

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exam Other Question

what is a dedikend cut? (please elaborate with clear examples) I am having difficulty with functions, can someone please help. Determine which functions are inverse to each other. f(x)=6x, g(x)=x/6, h(x)=6/x
Thank you