UPSKILL MATH PLUS

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1. If \(x^3 + 6x^2 + kx + 6\) is exactly divisible by \((x + 2)\), then \(k =\) .
 
2. If \(x^{51} + 51\) is divided by \(x + 1\), then the remainder is .
 
3. If \(p(a) = 0\) then \((x - a)\) is a  of \(p(x)\).