If \( \alpha, \beta \) are roots of \( x^{2}+p x+q=0 \) and \( \gamma, \delta \) are the roots o...
If \( \alpha, \beta \) are roots of \( x^{2}+p x+q=0 \) and \( \gamma, \delta \) are the roots of \( x^{2}+p x-r=0 \) then \( (\alpha-\gamma)(\alpha-\delta) \) is equal to
(a) \( q+r \)
(b) \( q-r \)
(c) \( -(q+r) \)
(d) \( -(p+q+r) \)
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