Question

$if \: \alpha \: and \beta \: are \: the \: zeros \: of \: the \: quadratic \: polynomial \: f(x) = x { }^{2} + x - 2 \: find \: the \: value \: of \: \frac{1}{ \alpha } - \frac{1}{ \beta }$
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Answer 1

what is this???Can u plz explain it properly