Mathematics, 03.11.2019 03:31 Theresab2021

1. how many complex roots does the polynomial equation have?

−3x^4−7x+17=0

a. 2

b. 3

c. 4

d. 5

2. which answer best describes the complex zeros of the polynomial function?

f(x)=x^3+x^2−8x−8

a. the function has two real zeros and one nonreal zero. the graph of the function intersects the x-axis at exactly one location.

b. the function has one real zero and two nonreal zeros. the graph of the function intersects the x-axis at exactly two locations.

c. the function has one real zero and two nonreal zeros. the graph of the function intersects the x-axis at exactly one location.

d. the function has three real zeros. the graph of the function intersects the x-axis at exactly three locations.

3. how many complex roots does the equation 0=4x^4−x^3−5x+3 have?

a. 3

b. 4

c. 5

d. 6

4. what is the completely factored form of f(x)=x^3+4x^2+7x+6?

5. what is the complete factorization of the polynomial function over the set of complex numbers?

f(x)=x^3+3x^2+16x+48

note: the file attached below is for question #4

1. how many complex roots does the polynomial equation have? −3x^4−7x+17=0<

Answers: 3

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Answers

Answer from: diamondalize21p84czi

1) There are two complex roots. A is correct.

2) The function has three real zeros. The graph of the function intersects the x-axis at exactly three locations. D is correct

3) There are four complex roots. B is correct.

4) C is correct. $f(x)=(x+2)(x-(-1+i\sqrt{2})(x-(-1-i\sqrt{2})$

5) (x+3)(x+4i)(x-4i)

Step-by-step explanation:

1) Number of complex root.

-3x^4-7x+17=0

We can not factor it completely. Because it's prime equation. We will make the graph of -3x^4-7x+17=0 and then see the x-intercept of the graph.

Because number x-intercepts are the zeros of polynomial. Please see the attachment for graph. In graph we can see it cuts only two points but their highest degree is 4. Maximum possible roots are 4 but only 2 are real and 2 are complex.

Thus, There are two complex roots.

2) This is cubic polynomial function.

Maximum number of zeros should be 3.

Please see the graph with attachment.

Zeros is a value of x where graph cuts x-axis. In graph we can see graph cuts x-axis at three points.

Thus, The function has three real zeros. The graph of the function intersects the x-axis at exactly three locations.

3) This is 4th degree polynomial.

Maximum number of zeros should be 4.

Please see the graph of polynomial.

Zeros is a value of x where graph cuts x-axis. In graph we can see doesn't cut x-axis at any points.

Thus, The function has four complex zeros. The graph of the function does not intersects the x-axis at any point.

4) We are given 3 degree polynomial. We need to factor it. First we split middle term and then factor it.

f(x)=x^3+4x^2+7x+6

f(x)=x^3+2x^2+2x^2+4x+3x+6

f(x)=x^2(x+2)+2x(x+2)+3(x+2)

f(x)=(x+2)(x^2+2x+3)

Now we factor quadratic part using quadratic formula

x^2+2x+3

$x=-1+i\sqrt{2},-1-i\sqrt{2}$

Complete factor of f(x)

Thus, $f(x)=(x+2)(x-(-1+i\sqrt{2})(x-(-1-i\sqrt{2})$

5) This is cubic polynomial. We need to factor it.

f(x)=x^3+3x^2+16x+48

First we make two group and then factor it

f(x)=x^2(x+3)+16(x+3)

f(x)=(x+3)(x^2+16)

f(x)=(x+3)(x+4i)(x-4i)

Thus, complete factor of f(x) is (x+3)(x+4i)(x-4i)

1. how many complex roots does the polynomial equation have? −3x^4−7x+17=0 a. 2 b. 3 c. 4 d. 5 2. w

Answer from: korar87181

(1) The total number of complex roots in the polynomial f(x)=-3x^4-7x+17=0 is 2 while the other two roots are real.

(2) Option D: The function has three real zeros. The graph of the function intersects the x-axis at exactly three locations.

(1)The given polynomial equation is f(x)=-3x^4-7x+17=0

Here, equation won't be able to completely factor it in. It's due to the fact that it's a prime equation. We'll create a graph of f(x)=-3x^4-7x+17=0 .

Because the zeros of a polynomial are number x-intercepts . The graph can be seen in the attached. We can observe that it only cuts two spots in the graph, although their highest degree is . There are a total of four possible roots, however only two are real and two are complex.