Question

x+7 is factor of x³+3x²+3x +1 by long division

Answer 1

$\huge\boxed{\texttt{\fcolorbox{Red}{aqua}{Hey Mate!!!}}}$

$<b><i><font face=Copper black size=4 color=blue>$ Here is your answer.
In the attachment

Remainder is -216
so x + 7 is not the factor of this equation.


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Answer 2

Hi friends

Here is your answer

$\frac{ {x}^{3} + 3 {x}^{2} + 3x + 1}{x + 7} \\ \\ = {x}^{2} - 4x + 31$

Remainder is -216

Hope it helps you