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Solving a Quadratic Equation by Factorization Method

In a standard...

Question

In a standard biquadratic equation $a x^{4} + b x^{3} + c x^{2} + d x + e = 0$ , what is the sum of roots taken three at a time?

\frac{- d}{a}

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\frac{c}{a}

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\frac{- e}{a}

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\frac{b}{a}

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Solution

The correct option is D $\frac{- d}{a}$
$= - \frac{c o - e f f i c i e n t o f x^{4 - 3}}{c o - e f f i c i e n t o f x^{4}} = - \frac{d}{a}$

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