Question

(b-5)3+125
$(x - 5) {3 + 125}^{?}$

Answer 1

$(x-5)^2+125=(x-5)^3+5^3=\\=Big (x-5+5Big )Big ((x-5)^2-5(x-5)+5^2Big )=\\=xcdot (x^2-10x+25-5x+25+25)=\\=xcdot (x^2-15x+75)$