Question

4-X2 =0 чему равен x?

Answer 1

4-X2 =0 
х2=4
х=2
х=-2.......................

Answer 2

4 - X^2 = 0 
( 2 - X)*(2 + X ) = 0
--------------------
2 - X = 0 
X = 2 
--------------
2 + X = 0
X = - 2 
------------
Ответ 2 и ( - 2 )