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Chapter 4: Q. 12 (page 209)

Use the Remainder Theorem to find the remainder when f(x)is divided by x-c. Then use the Factor Theorem to determine whether x-cis a factor of f(x).

f(x)=-4x3+5x2+8;x+3

Short Answer

Expert verified

The remainder is161andx+3is not a factor.

Step by step solution

01

Step 1. Given information.

The given function is,

f(x)=-4x3+5x2+8;x+3.

02

Step 2. Using remainder theorem.

We know that if f(x)is divided by x-cthen the remainder will be f(c).

Here f(x)is divided by x+3, then the remainder is f(-3)that is

f(-3)=-4-33+5-32+8=-4-27+59+8=108+45+8=161

Therefore, the remainder is 161.

03

Step 3. Using factor theorem.

We know that if x-cis the factor of the polynomial f(x)then

f(c)=0,

Here c=-3, then

f(c)=f(-3)=161

We observe that f(-3)鈮�0,then x+3is not a factor.

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