How do you use the remainder theorem to determine the remainder when the polynomial (n^4-3n^2-5n+2)/(n-2)n43n25n+2n2?

1 Answer
Dec 30, 2016

R=-4R=4

Explanation:

The remainder theorem states that if a polynomial " "P(x)" " P(x) is divided by the linear factor (x-a)" "(xa) then the remainder is " "P(a) P(a)

proof;

let " "P(x) " " P(x) be divided by " "(x-a)" " (xa) to give quotient " "Q(x)" " Q(x) and remainder " "R R

then:" "P(x)=(x-a)Q(x)+R P(x)=(xa)Q(x)+R

so:" "P(a)=cancel((a-a)Q(a))+R

" ":.P(a)=R" "as required.

In this case we have :(n^4-3n^2-5n+2)-:(n-2)

P(n)=n^4-3n^2-5n+2

the divisor is " "n-2=>a=2

R=P(2)=2^4-3xx2^2-5xx2+2

R=P(2)=16-12-10+2=-4