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\left(r-5\right)\left(r^{2}+5r-40\right)
By Rational Root Theorem, all rational roots of a polynomial are in the form \frac{p}{q}, where p divides the constant term 200 and q divides the leading coefficient 1. One such root is 5. Factor the polynomial by dividing it by r-5. Polynomial r^{2}+5r-40 is not factored since it does not have any rational roots.