The number of negative real roots of x^4 −4x−1=0 is


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Question Number 5639 by Daily last updated on 23/May/16

$The number of negative real roots$ $of x^{4} - 4 x - 1 = 0 is$
Commented by Yozzii last updated on 23/May/16

$D e s c a r t e s r u l e o f s i g n s m a y h e l p .$
	Answered by Rasheed Soomro last updated on 27/May/16

	$T h e e q u a t i o n h a s n o s i g n v a r i a t i o n$ $s o i t h a s n o p o s i t i v e r o o t .$ $R e p l a c e x b y - x$ ${(- x)}^{4} - 4 (- x) - 1 = 0$ $\Rightarrow x^{4} + 4 x - 1 = 0$ $T h i s h a s o n e v a r i a t i o n o f s i g n s$ $S o t h e g i v e n e q u a t i o n h a s o n e n e g a t i v e$ $r o o t .$
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