exam Maths Puzzle Numerical Ability

f(x)=7x+2 find f(x) when x=0 and when x=1

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exam Other Question

Solve by completing the square

x^2-16x+63=0

Thanks for any help. Use the addition and subtraction formulas to simplify cos(x-3pi/2).

I came up with cosx for my answer. Is this correct?