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find the value of k, if x-3 is a factor of x - 4x + k

Since x - 3 is a factor P(3) = 0
Put x = 3 in equation and solve for k
 x - 4x + k
3 - 4 x 3 + k
3 - 12 = - k
-9 =-k
k = 9


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