exam Maths Puzzle Numerical Ability

How can you simplify x to the "a" minus x to the "b"?

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exam Other Question

Factor the polynomial f(x). Then solve the equation f(x)=0
f(x)=x^3+4x^2-17x-60
There are two real values of r for which:

(x^4)-(x^3)-(18x^2)+52x+k

has a factor of the form x-r. One of these values is r=2. What is the other value of r?
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