## College Algebra 7th Edition

$(x-y-5)(x+y+5)$
RECALL: $A^2-B^2=(A-B)(A+B)$ Factor the difference of two squares using the formula above with $A=x$ and $B=y+5$ to obtain: $=[x-(y+5)][x+(y+5)] \\=(x-y-5)(x+y+5)$