Find all the zeroes of the polynomial x4 – 3x3 + 6x – 4 , if two of its zeroes are√2 and -√2
Answers
Answer:
x= ± √2
(x)^2= ±(√2)^2
x^2=2
x^2-2= 0
x4 – 3x3 + 6x – 4 by x^2-2
x^2 - 3x -2 ----- REMAINDER
------------------------
x^2-2 ║ x4 – 3x3 + 0x2+6x – 4
x4 - 0x3+ 2x2
(-) (+) (-)
--------------------------------
-3x3 - 2x2 + 6x - 4
-3x3 - 0 x2 + 6x
(+) (+) (-)
---------------------------------
-2x2 - 4
-2x2 - 4
(+) (+)
---------------------------------
0 0
By factorizing method
= x^2 - 3x -2
= x^2 -2x -x -2
= x(x-2)-1(x-2)
(x-1) = (x-2)
x=1 or x=2
HOPE THIS HELP U