k3+6k2+9k+4divide by k+1
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if k is a factor then,
( k+1) = 0
k = -1putting value of k in the equation, k³+6k²+9k+4
-1³+6(-1)²+9×-1+4
-1+6-9+4
-10+10 = 0
Hence it is clear that, x-1 is a factor of k³+6k²+9k+4....
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