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Zarrin [17]
3 years ago
5

Given f(x) = x2 + kx + 11, and the remainder when f(x) is divided by x + 1 is

Mathematics
1 answer:
Gennadij [26K]3 years ago
5 0

Answer:

k=-9

Step-by-step explanation:

According to the Polynomial Remainder Theorem, when dividing a polynomial  P(<em>x</em>) by a binomial in the form (<em>x - </em>a), the remainder will be given by P(a).

We are given the polynomial:

f(x)=x^2+kx+11

And it is divided by the binomial:

x+1

The remainder is 21.

Rewriting the divisor yields:

x-(-1)

So, <em>a</em> = -1.

Then by the PRT:

f(-1)=(-1)^2+k(-1)+11=21

Simplify:

1-k+11=21

Solve for <em>k: </em>

<em />k=-9<em />

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see below

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