Questions: Question 3
5 pts
Find the zeros of f(x), given that one zero is k.
f(x) = x^4 - 6x^3 + 3x^2 + 24x - 28 k=2
±2, -3 ± 2i
±2, 3 ± √2
±2, 3 ± 2i
±2, -3 ± √2 i
Transcript text: Question 3
5 pts
Find the zeros of $f(x)$, given that one zero is $k$.
\[
f(x)=x^{4}-6 x^{3}+3 x^{2}+24 x-28 \quad k=2
\]
$\pm 2,-3 \pm 2 i$
$\pm 2,3 \pm \sqrt{2}$
$\pm 2,3 \pm 2 i$
$\pm 2,-3 \pm \sqrt{2} i$
Solution
Solution Steps
To find the zeros of the polynomial \( f(x) = x^4 - 6x^3 + 3x^2 + 24x - 28 \) given that one zero is \( k = 2 \), we can use polynomial division to factor out \( (x - 2) \) from \( f(x) \). After factoring, we solve the resulting polynomial equation to find the remaining zeros.
Step 1: Identify the Given Polynomial
We are given the polynomial \( f(x) = x^4 - 6x^3 + 3x^2 + 24x - 28 \) and know that one of its zeros is \( k = 2 \).
Step 2: Factor the Polynomial
Using polynomial division, we factor out \( (x - 2) \) from \( f(x) \). This results in a cubic polynomial, which we can denote as \( g(x) \).
Step 3: Find the Remaining Zeros
After factoring, we find the zeros of the cubic polynomial \( g(x) \). The zeros of the original polynomial \( f(x) \) are the solutions to \( g(x) = 0 \) along with the known zero \( k = 2 \).
From the calculations, the zeros of \( f(x) \) are approximately:
\( 4.4142 \)
\( -2 \)
\( 2 \)
\( 1.5858 \)
Final Answer
The zeros of the polynomial \( f(x) \) are:
\[
\boxed{2, -2, 4.4142, 1.5858}
\]