If p and q are the roots of the equation...

If p and q are the roots of the equations ` x^(2) - 3x+ 2 = 0 ` , find the value of `(1)/(p) - (1)/(q)`

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If p and q are the roots of the equation x^(2)+p x+q=0 then

` p=1`

` p=1 or 0`

`p=-2`

`p=-2 or 0`

If alpha and beta are the roots of the equation x^(2) - p(x + 1) - q = 0 , then the value of : (alpha^(2) + 2 alpha + 1)/(alpha^(2)+ 2 alpha + q) + (beta^(2) + 2 beta + 1)/(beta^(2) + 2 beta + q) is :

The roots of the equation (q- r) x^(2) + (r - p) x + (p - q)= 0 are

`(r-p)/(q - r) , (1)/(2)`

`(p - q)/(q - r) , 1`

`(q- r)/(p-q) , 1`

`(r- p)/(p - q) , (1)/(2)`