1. By Grup 6

3. X2 = X2
X2 - X2 = X2 - X2
X (X - X ) = ( X + X )( X - X )
X (X - X ) = ( X + X )( X - X )
X = X + X
X = 2 X
1 = 2 (1)
So …….
1 = 2
+( -X2 )
X2 - Y2 = (X - Y )(X + Y)