Question

100-x^2=0 ( пшшшшшшшшшшшш )

Answer 1

$100-x^2=0 \ x^2=100 \ x_1=-10 \ x_2=10$

Answer 2

100 = X^2 
10 ^2 = X ^2 
Ответ + 10 и ( - 10 )