Question

If p, q and r are the roots of a cubic polynomial $a{x}^3+b{x}^2+cx+d$, then what will be the value of pq + qr + rp?

• A. $-\frac{b}{a}$
• B. $\frac{b}{a}$
• C. $-\frac{d}{a}$
• D. $\frac{c}{a}$

Answer 1

The correct option is D $\frac{c}{a}$

If p, q and r are the zeroes of the cubic polynomial
$a{x}^3+b{x}^2+cx+d$, then

$pq+qr+rp=\frac{c}{a}$