Find all zeroes of the polynomial (2x4 – 9x3 + 5x2 + 3x – 1) if two of its zeroes are (2 + √3) and (2 – √3)
Answers
Step-by-step explanation:
X = 2 + √3 and x = 2 - √3 are Zeros of p ( x )
( x - 2 - √3 ) ( x - 2 + √3 )
( using identity ( a - b ) ( a +b ) = a² - b²
then,
( x - 2 )² - ( √3 )²
x² + 4 - 4x - 3
x² + 1 - 4x .... ( i )
When we divide p ( x ) by ( i ) we get the other zeros
Other zeros are :- x = 1 and x = -1/2
Answer:
All zeroes of p ( x ) are 1 , - 1 / 2 , 2 + √ 3 and 2 - √ 3
Step-by-step explanation:
Given :
p ( x ) = 2 x⁴ - 9 x³ + 5 x² + 3 x - 1
Two zeroes of p ( x ) :
2 + √ 3 and 2 - √ 3
p ( x ) = ( x - 2 - √ 3 ) ( x - 2 + √ 3 ) × g ( x )
g ( x ) = p ( x ) ÷ ( x² - 4 x + 1 )
On dividing ( 2 x⁴ - 9 x³ + 5 x² + 3 x - 1 ) by ( x² - 4 x + 1 )
We got ,
g ( x ) = 2 x² - x - 1
By splitting mid term
2 x² - 2 x + x - 1
2 x ( x - 1 ) + ( x - 1 )
( x - 1 ) ( 2 x + 1 )
Now zeroes of g ( x )
x = 1 or x = - 1 / 2 .