2x
3 – 6 = - 6x
2 + 2x
2x
3 – 6 = - 6x
2 + 2x /+ 3x
2
2x
3 + 6x
2 – 6 = 2x / -2x
2x
3 + 6x
2 – 2x – 6 = 0
( 2x
3 + 6x
2 ) – ( 2x + 6 ) = 0
x
2 ( 2x + 6 ) – ( 2x + 6 ) = 0
( 2x + 6 )( x
2 – 1) = 0
( 2x + 6 )( x – 1 )( x + 1 ) = 0
-
(2x + 6) = 0
2x + 6 = 0 /-6
2x = -6 /:2
x = -3
-
(x – 1) = 0
x – 1 = 0 / +1
x = 1
-
(x + 1) = 0
x+1 = 0 / - 1
x = – 1