exam Maths Puzzle Numerical Ability

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For each Function F, construct and simplify the difference quotient

f(x)=2-x^2

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exam Other Question

"With the exception of 2 and 3, every prime number is a multiple of 6, add or take away 1. Is this true?" (x^4+7x^3+12x^2)/(x3+8x^2=15x)