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If the polynomial $x^4 - 6x^3 + 16x^2 - 25x + 10$ is divided by another polynomial $x^2 - 2x + k$, the remainder comes out to be $x + a$, find $k$ and $a$.
Given:
The polynomial $x^4 - 6x^3 + 16x^2 - 25x + 10$ is divided by another polynomial $x^2 - 2x + k$, the remainder comes out to be $x + a$.
To do:
We have to find $k$ and $a$.
Solution:
Let $p(x) = x^4 – 6x^3 + 16x^2 – 25x + 10$
Remainder $= x + a$....… (i)
Dividing the given polynomial $6x^3 + 16x^2 – 25x + 10$ by $x^2 – 2x + k$, we get,
$x^2-2x+k$)$x^4-6x^3+16x^2-25x+10$($x^2-4x+8-k$
$x^4-2x^3+kx^2$
------------------------------
$-4x^3+(16-k)x^2-25x+10$
$-4x^3+8x^2-4kx$
-------------------------------
$(8-k)x^2-(25-4k)x+10$
$(8-k)x^2-(16-2k)x+8k-k^2$
----------------------------
$(-9+2k)x+10-8k+k^2$
Using equation (i), we get,
$(-9 + 2k)x + 10-8 k + k^2 = x + a$
On comparing the like coefficients, we get,
$-9 + 2k = 1$
$2k = 9+1$
$2k=10$
$k = 5$...….(ii)
$10 -8k + k^2 = a$...….(iii)
Substituting the value of $k = 5$, we get,
$10 – 8(5) + (5)^2 = a$
$10 – 40 + 25 = a$
$35 – 40 = a$
$a =-5$
Hence, $k = 5$ and $a = -5$.
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