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for all quadratic equation,
x²-(sum of roots)x+product of roots=0
4.
(1) no[ as 1+(-1) is not equal 4]
(2)no[2+5/2 is not equal 5]
5. putting value of x=3 we can find k=3
6.
2/5=-7/5×à[à is another root of the quadratic equation]
à=-2/7
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