arre this is simple taara :) if x = a is a root then (x-a) is a factor of the polynomial.. and since it is m times thus it is (x-a)^m is a factor of the polynomial
and thus F(X) (of degree n ) = (x-a)^m (g(x)) where g(x) is of power( n - m) because total degree of equation in left and right must be same which is n
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