Question

решите уравнение $( sqrt{8+x})( sqrt{8-x})=x$

Answer 1

( √ 8 + Х )*( √ 8 - X ) = X 
√ ( 64 - X^2 ) = X 
( √ 64 - X^2 )^2 = X^2 
64 - X^2 = X^2 
64 = 2X^2 
32 = X^2 
X1 = √ 32 = 4 √ 2 
X2 = - 4 √ 2