if alpha and beeta are the zeroes of quadratic polynomial f(x) x2 + x -2, then find the value of 1/alpha-1/beeta
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p(x)=x^2+x-2
1/a+1/b=a-b/ab.
=-(a+b)/ab (1)
a+b=-1. (2)
ab=-2. (3)
substituting (2) and (3) in (1) we get
-(-1)/2=1/2
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