exam Maths Puzzle Numerical Ability

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

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exam Other Question

convert to power of ten and standdard form

3,456,7000,000 simplify:

(x^3+3*x^2)/(2*x)*(5*x^3)/(x^2+5*x+6)

Thanks so much:)