4-2.Quadratic Equations and Inequations
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समीकरण $x^5\left(x^3-x^2-x+1\right)+x\left(3 x^3-4 x^2-2 x+4\right)-1$ $=0$ के भिन्न वास्तविक मूलों की संख्या है $.........$

A

$8$

B

$3$

C

$5$

D

$0$

(JEE MAIN-2022)

Solution

$x ^{5}\left( x ^{3}- x ^{2}- x +1\right)+ x \left(3 x ^{3}-4 x ^{2}-2 x +4\right)-1=0$

$( x -1)^{2}( x +1)\left( x ^{5}+3 x -1\right)=0$

Let $f(x)=x^{5}+3 x-1$

$f^{\prime}(x)>0 \forall x \in R$

Hence $3$ real distinct roots.

Standard 11
Mathematics

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