Question

Друзья помогите!!
(5+х)²+x²-25=0

Answer 1

(5+x)^2+x^2-25=(5+x)(5+x)+(x-5)(x+5)=(5+x+x-5)(5+x)=2x(x+5)

2x(x+5)=0

2x=0. или x+5=0

x=0. x=-5