2. Polynomials
medium

જો $x-a$ એ $x^3 - ax^2 + 2x + a - 1$ નો એક અવયવ હોય, તો $a$ ની કિંમત શોધો.

A

$\frac{1}{3}$

B

$1$

C

$-1$

D

$\frac{1}{2}$

Solution

ધારો કે $p(x)=x^{3}-a x^{2}+2 x+a-1$

$x-a$ એ $p(x)$ નો અવયવ હોવાથી, $p(a)=0$ 

$\therefore a^{3}-a(a)^{2}+2 a+a-1=0$

$\therefore \quad a^{3}-a^{3}+2 a+a-1=0$

$\therefore \quad 3 a=1$

$\therefore$ $a=\frac{1}{3}$

Standard 9
Mathematics

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