​If alpha & beta are zeroes of the quadratic polynomial x2 - 6x + 8, then find the value of alpha - beta (alpha > beta)

please explain the answer step by step

First finding the value of alpha and beta......
x2 - 6x + 8
x- 4x - 2x + 8
x(x - 4) -2(x - 4)
(x - 4)(x - 2)
So, therefore alpha = 4 and beta = 2     (as alpha > beta )
Hence, alpha - beta
         = 4 - 2
          = 2

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