CBSE Class 10 Answered
polynomials..........................
Asked by | 08 Mar, 2009, 10:28: PM
Expert Answer
x and y are roots of ax2+bx+c = 0
Then x+y = -b/a and xy = c/a
Now, (x-y)2 = x2 + y2 - 2xy
= (x+y)2 - 2xy - 2xy = (x+y)2 - 4xy = (-b/a)2 - 4(c/a) = b2 / a2 - 4c/a
Hence, x-y = 
(b2 / a2 - 4c/a)
Answered by | 09 Mar, 2009, 11:50: AM
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