93rd Problem 2016

Algebra Level 3

Find the remainder when

f ( x ) = 5 x 4 2 x 3 + 3 x 2 + x 32 f(x)=5x^4-2x^3+3x^2+x-32

is divided by x 2 x-2 .


The answer is 46.

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1 solution

Sravanth C.
Mar 26, 2016

From the remainder factor theorem , we know that the remainder when a polynomial is divided by x a x-a is given by f ( a ) f(a) , thus the remainder when the given function is divided by x 2 x-2 will be:

f ( 2 ) = 5 ( 2 4 ) 2 ( 2 3 ) + 3 ( 2 2 ) + 2 32 = 64 + 14 32 = 32 + 14 = 46 \begin{aligned} f(2)&=5(2^4)-2(2^3)+3(2^2)+2-32\\ &=64+14-32\\ &=32+14\\ &=\boxed{46}\\ \end{aligned}

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