exam Maths Puzzle Numerical Ability

If f(x)=x^2-6x+8, what is the value of f(7)-f(3)?

a. -1
b. 0
c. 14
d. 15
e. 16

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exam Other Question

x+y+z=8.25 I am drawing a blank on this; do I multiply or add the denominators?
(x-1/3)*(x+1/3)