Q.

Find the remainder when x3+3x2+3x+1 is divided by x+π.


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a

π

b

−π2+3π3−3π+1

c

−π3+3π2−3π+1

d

None of these 

answer is C.

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Detailed Solution

Let us first of all mention what the remainder theorem says:-
Remainder theorem: The Remainder Theorem states that if a polynomial f (x) is divided by (x - k) then the remainder r = f (k), where r is the remainder.
If we compare this to the given situation to us with this remainder theorem:-
We have f(x) = x3+3x2+3x+1 and k = −π.
So, the required remainder should be f(−π).
Since, f(x)= x3+3x2+3x+1
Therefore, f(−π)=(−π)3+3(−π)2+3(−π)+1
We know that the cube of negative is also negative but the square of negative is always positive.
⇒f(−π)=−π3+3π2−3π+1
Hence, the required correct answer is (3).
 
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