Упростите выражение (5+m)^2+(m-2)(m+2)-2m(m+5)

Question

Упростите выражение
(5+m)^2+(m-2)(m+2)-2m(m+5)

Answer 1

(5+m)²+(m-2)(m+2)-2m(m+5) =25+10m+m²+m²-4-2m²-10m=21

Answer 2

(5+m)^2+(m-2)(m+2)-2m(m+5)=25+10m+m^2+m^2+2m-2m-4=21+2m^2+10m