(2m-x)(2m+x)+x в квадрате?

Question

(2m-x)(2m+x)+x в квадрате?

Answer 1

4m(кв)+2mx-2mx-x(кв)+x(кв)=4m (кв)

Answer 2

(2m-x)(2m+x)+x^2=(4m^2-x^2)+x^2=4m^2-x^2+x^2=4m^2