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Mila [183]
3 years ago
15

Which answer best describes the complex zeros of the polynomial function? f(x)=x3+x2−8x−8

Mathematics
2 answers:
lidiya [134]3 years ago
5 0

Answer:

a

Step-by-step explanation:

took the test

Valentin [98]3 years ago
4 0

we are given

f(x)=x^3+x^2-8x-8

We can use Descarte's sign rule to find number of real roots

Positive real roots:

f(x)=x^3+x^2-8x-8

we can see that number of sign changes in this function is 1

so, number of positive real root =1

Negative real roots:

Firstly, we will find f(-x)

f(-x)=(-x)^3+(-x)^2-8(-x)-8

f(-x)=-x^3+x^2+8x-8

we can see that number of sign changes in this function is 2

so, number of negative  real root =2

so, total number of real roots = number of positive real roots + number of negative real roots

total number of real roots =1+2

total number of real roots =3

Since, the degree of this polynomial is 3

so, maximum number of roots must be 3

We know that all roots are also called x-intercept because it crosses x-axis at that value

so, function will cross x-axis thrice

so, option-A.......Answer


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Show whether the values x=4 and y =5 make inequality 7x-3y<19
Valentin [98]

Answer:

The inequality is true.

Step-by-step explanation:

To show that it is true, you simply sub in 4 for x and 5 for y and see if the statement is true or not

7(4)-3(5) < 19

28-15 < 19

13 < 19

7 0
3 years ago
THe equation of the graph line is 2x-3y=12 what is the x-intercept of the graph
katrin2010 [14]

2x-3y=12


Make y substitute 0


2x-3(0)=12


2x= 12


X= 12-2


X= 10


X-intercept is 10

5 0
3 years ago
What is 2 + 5 - 2 x 9 = ? The person who gets it right, I will make you brainliest.
Minchanka [31]
PEMDAS
Multiplication: 2 + 5 - 18=
Addition: 7-18=
Subtraction: -11
Answer=-11
5 0
3 years ago
Read 2 more answers
Question 2 (2 points)<br> Subtract.<br> A) -18 - (-12) =<br> on &amp;<br> 5
muminat

Answer:

-6

(I don’t understand what you mean by on & 5 but..)

Step-by-step explanation:

The two negatives (the -(- ) cancel each other out and make a postive, so

-18 + 12 = -6

7 0
3 years ago
Read 2 more answers
1.Find the zeros of f(x) = x2 - 9
Marat540 [252]
So for the first one it is (x-3)(x+3) this is because it is a difference of squares so you square root the 9 and the minus you do both +and - in order to keep up the -9
The zeros are:x=3 and x=-3 ( this is because you change the sign in the bracket


the others should be pretty simple to do for number 2 its a complex
the third is a simple trinomial
and fourth is simple trinomial as well
6 0
3 years ago
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