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2. Polynomials
medium
$x^{3}+3 x^{2}+3 x+1$ को निम्नलिखित से भाग देने पर शेषफल ज्ञात कीजिए
$x+1$
A
$0$
B
$3$
C
$8$
D
$2$
Solution
$\because $ The zero of $x +1$ is $-1$ $[\because x +1=0 \Rightarrow x =-1]$
And by remainder theorem, when
$p ( x )= x ^{3}+3 x ^{2}+3 x +1$ is divided by $x +1,$ then remainder is $p (-1)$
$\therefore$ $p (-1)=(-1)^{3}+3(-1)^{2}+3(-1)+1$
$=-1+(3 \times 1)+(-3)+1=-1+3-3+1=0$
Thus, the required remainder $=0$
Standard 9
Mathematics