Which of the following describes the zeroes of the graph of f(x) = –x5 + 9x4 – 18x3?
A. 0 with multiplicity 3, –3 with multiplicity 2, and –2 with multiplicity 1
B. 0 with multiplicity 3, 3 with multiplicity 1, and 6 with multiplicity 1
C. 0 with multiplicity 3, 3 with multiplicity 2, and 2 with multiplicity 1
D. 0 with multiplicity 3, –3 with multiplicity 1, and –6 with multiplicity 1

Respuesta :

Answer:

B. 0 with multiplicity 3, 3 with multiplicity 2, and 2 with multiplicity 1

Step-by-step explanation:

Took a test

Factoring and solving the equation, it is found that the zeroes are:

B. 0 with multiplicity 3, 3 with multiplicity 1, and 6 with multiplicity 1.

The function is:

[tex]f(x) = -x^5 + 9x^4 - 18x^3[/tex]

Simplifying by [tex]-x^3[/tex]:

[tex]f(x) = -x^3(x^2 - 9x + 18)[/tex]

The zeroes are the values of x for which:

[tex]f(x) = 0[/tex]

[tex]-x^3 = 0 \rightarrow x = 0[/tex]

0 has multiplicity 3.

And:

[tex]x^2 - 9x + 18 = 0[/tex]

Quadratic equation with [tex]a = 1, b = -9, c = 18[/tex].

[tex]\Delta = (-9)^{2} - 4(1)(18) = 9[/tex]

[tex]x_{1} = \frac{-(-9) + \sqrt{9}}{2(1)} = 6[/tex]

[tex]x_{2} = \frac{-(-9) - \sqrt{9}}{2(1)} = 3[/tex]  

6 and 3 with multiplicity 1, thus option B.

A similar problem is given at https://brainly.com/question/19776811