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marysya [2.9K]
3 years ago
14

Let $f(x) = x^{10}+5x^9-8x^8+7x^7-x^6-12x^5+4x^4-8x^3+12x^2-5x-5$.

Mathematics
1 answer:
IgorLugansk [536]3 years ago
6 0
Plug in 1
and −1
to get two values of r(x)
which is linear. From there you can get what a,b
are in ax+b.

Since
f(x)=g(x)(x+1)(x−1)+r(x)
we have

f(1)=g(1)(1+1)(1−1)+r(1)=r(1)=−10
f(−1)=g(1)(−1+1)(−1−1)+r(−1)=r(−1)=16
We know the remainder is of degree 1
, so

r(x)=ax+b
and now we know,
r(1)=ax+b=a+b=−10
r(−1)=ax+b=−a+b=16
so, solve

a+b=−10
−a+b=16
which yields, a=−13
b=3
, so

r(x)=−13x+3
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