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If x^(2) - 3x + 2 is factor of x^(4) - p...

If `x^(2) - 3x + 2` is factor of `x^(4) - px^(2) + q` then `2q - p` is equal to

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The correct Answer is:
`3`
`x^(2) - 3x + 2 = 0`
`(x - 2)(x - 1) = 0 rArr x = 1 , 2`
so `1 - p + q = 0 rArr p = +5`
`16 - 4p + q = 0`
`2q - p = 8 -5 = 3`
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