Answer
$x^{2}+5x-50$
Work Step by Step
Using the FOIL method, $(x-5)(x+10)=(x)(x)+(x)(10)+(-5)(x)+(-5)(10)=x^{2}+10x+(-5x)+(-50)=x^{2}+10x-5x-50=x^{2}+5x-50$.
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