Answer
$x^2-y^2+10x+25$
Work Step by Step
First we use the Sum and Difference of Two Terms:
$[(x+5)-y][(x+5)+y]$
$=(x+5)^2-y^2.$
Then we use the Square of a Binomial:
$(x+5)^2-y^2$
$=x^2+10x+25-y^2$
$=x^2-y^2+10x+25.$
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