ó x4 + 2x3 – 6 x2
-16x -8 = 0
ó x3.(
x + 2 ) – 6x.( x + 2 ) – 4.( x + 2 ) = 0
ó ( x + 2 ).(
x3 - 6x – 4 ) = 0
ó * x = -2
* x3 +
2x2 – 2x2 – 4x -2x – 4 = 0
ó
( x + 2 ).( x2 – 2x -2 )
= 0
ó
x = -2
.x = 1 +/- căn3 ( không TM ).
=> x = -2.
times="" new="" roman";mso-hansi-font-family:"times="" roman";mso-char-type:symbol;="" mso-symbol-font-family:wingdings"="">ó x4 + 2x3 – 6 x2
-16x -8 = 0
times="" new="" roman";mso-hansi-font-family:"times="" roman";mso-char-type:symbol;="" mso-symbol-font-family:wingdings"="">ó x3.(
x + 2 ) – 6x.( x + 2 ) – 4.( x + 2 ) = 0
times="" new="" roman";mso-hansi-font-family:"times="" roman";mso-char-type:symbol;="" mso-symbol-font-family:wingdings"="">ó ( x + 2 ).(
x3 - 6x – 4 ) = 0
times="" new="" roman";mso-hansi-font-family:"times="" roman";mso-char-type:symbol;="" mso-symbol-font-family:wingdings"="">ó * x = -2
* x3 +
2x2 – 2x2 – 4x -2x – 4 = 0
ó
( x + 2 ).( x2 – 2x -2 )
= 0
ó
x = -2
.x = 1 +/- căn3 ( không TM ).
=> x = -2. TM ĐK