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The roots of x^(2) - (a + 1) x + b^(2) ...

The roots of `x^(2) - (a + 1) x + b^(2) = 0` are equal . Then choose the correct value of a, b from the following option :
(a) `5,2` , (b) `3,4` , (c ) `5,-3` , (d) `5,4`

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The roots of `x^(2) - (a+1)x + b^(2) = 0` are equal
`rArr (a+1)^(2) - 4b^(2) = 0`
`rArr a+1 = +-2b`
From the options
`a = 5, b = - 3`satisfies the above relation.
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