Question

if r and s are roots of ax^2 + bx + c = 0, then the value of 1/r^2 + 1/s^2 is

Answer 1

if any doubt free to ask.....

Answer 2

$r + s = \frac{ - b}{a} \\ rs = \frac{c}{a} \\ \frac{1}{ {r}^{2} } + \frac{1}{ {s}^{2} } = \frac{ {(r + s) }^{2} - 2rs }{ {(rs)}^{2} } \\ solve \: it \: you \: got \: ans$