Evaluate
55r^{2}+800
Factor
5\left(11r^{2}+160\right)
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55r^{2}+800
Combine -5r^{2} and 60r^{2} to get 55r^{2}.
5\left(-r^{2}+12r^{2}+160\right)
Factor out 5. Polynomial 11r^{2}+160 is not factored since it does not have any rational roots.
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