Question

(x+10y)^2
as a single polynomial in standard form

Answer 1

$(x+10y)^2\\\\\text{Use}\ (a+b)^2=a^2+2ab+b^2\\\\=x^2+2(x)(10y)+(10y)^2=x^2+20xy+100y^2\\\\Answer:\ \boxed{(x+10y)^2=x^2+20xy+100y^2}$