Request a call back

If two of the zeroes of the polynomial f(x)=x4-4x3-20x2+104x-105 are 3+√2 and 3-√2,then use the division algorithm to find the other zeroes of f(x).

Asked by saiprathumnan35 | 26 Jun, 2020, 07:17: PM
Given polynomial is f(x)=x4-4x3-20x2+104x-105
Two of its zeroes are 3+√2 and 3-√2
Therefore, [x - (3 + √2)] and [x - (3 - √2)] are the zeroes of f(x)
Therefore, [x - (3 + √2)][x - (3 - √2)] = [x-3-√2][x-3+√2] = x2 - 6x + 9 - 2 = x2 - 6x + 7  divides the polynomial f(x)
Using long division to divide f(x) by (x2 - 6x + 7), we get the quotient as x2 + 2x - 15

The other factor of f(x) is x2 + 2x - 15
x2 + 2x - 15 = x2 + 5x - 3x - 15 = x(x+5) - 3(x+5) = (x+5)(x-3)
Hence, the other two zeroes are -5 and 3.
Answered by Renu Varma | 29 Jun, 2020, 11:21: AM

## Application Videos

CBSE 10 - Maths
Asked by mv716304 | 01 Apr, 2022, 05:16: PM
CBSE 10 - Maths
Asked by mahekk101 | 14 Sep, 2021, 08:24: PM
CBSE 10 - Maths
Asked by bhavikabhatia1125 | 03 Aug, 2021, 10:29: PM
CBSE 10 - Maths
Asked by Aasthaachd | 08 Jun, 2021, 01:39: PM
CBSE 10 - Maths
Asked by rk4353620 | 05 Jun, 2021, 01:52: PM
CBSE 10 - Maths