(w+5)^2 - 100
(w+5)^2 - 100 = (w+5)^2 - 10^2 since a^2 - b^2 = (a+b)(a-b)
so, (w+5)^2 - 10^2 = (w+5+10)(w+5-10) = (w+15)(w-5)Please appreciate my help, by selecting my answer as the best, Thanks!
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