All categories

3 years ago

Can someone check this for me? Thanks!

Mathematics

1 answer:

earnstyle [38]3 years ago

3 0

Answer:

two or zero positive real roots, one or zero negative real roots

Step-by-step explanation:

f(x) = 9x³ − 2x² − x + 5

There are 2 sign changes, so the number of positive real zeros is 2 or an even number less than that. So there are two or zero positive real roots.

f(-x) = 9(-x)³ − 2(-x)² − (-x) + 5

f(-x) = -9x³ − 2x² + x + 5

There is 1 sign change, so the number of negative real zeros is 1 or an even number less than that. So there is exactly 1 negative real root.

Your answer is correct.

You might be interested in

HELP HELP HELP FAST PLS PLS

riadik2000 [5.3K]

Answer:

a) System of equations will be: $x+y=500\: and\:5x+2y=1789$

b) Number of adult tickets sold = 263

Number of students tickets sold = 237

Step-by-step explanation:

Let:

Number of adult tickets sold = x

Number of students tickets sold = y

As Marc sold total 500 tickets, the expression will be: $x+y=500$

Student tickets cost $2 and adult tickets cost $5. Marc's sales totalled $1,789.

The expression will be: $5x+2y=1789$

So, system of equations will be: $x+y=500\: and\:5x+2y=1789$

Solve the system to find value of x and y

Let:

$x+y=500--eq(1)\\5x+2y=1789--eq(2)$

Multiply equation 1 by 2 and subtract

$2x+2y=1000\\5x+2y=1789\\-\:\:\:-\:\:\:\:\:\:\:\:\:-\\------\\-3x=-789\\x=\frac{-789}{-3}\\x=263$

We get value of x = 263

Now finding value of y by putting value of x in eq(1)

$x+y=500\\263+y=500\\y=500-263\\y=237$

We get value of y = 237

Number of adult tickets sold = x = 263

Number of students tickets sold = y = 237

3 0

3 years ago

Pilger corporation has cash on hand at year-end of $201,000 and a negative cash flow from operations of $144,000. what is the ra

aleksandrvk [35]

Thank you for posting your question here at brainly. I hope the answer will help you. Feel free to ask more questions.
Below are the choices that can be found elsewhere:

16.8 months
7.2 months
12.0 months
<span>1.4 months

</span>the ratio of cash to monthly cash expenses is 16.8 months

4 0

3 years ago

Hi! My first time on Brainly.. and I need help on this question thanks!

nexus9112 [7]

Answer: He is very tired.

Step-by-step explanation:

Slumped over, when u slump, you slouch. And slouching occurs when you are tired. I hope this helps!

3 0

3 years ago

Hi guys, I need some help with this. Look at the screenshot below.

ASHA 777 [7]

Answer:

20%

Step-by-step explanation:

54-45 = 9

9/45 = 0.2

0.2*100 = 20

Production increased 20%

6 0

2 years ago

Philip jogged 3 1/2 miles yesterday in 7/8 of an hours what is his constant of proportionality

marishachu [46]

Answer:

4 miles per hour

Step-by-step explanation:

Let the miles jogged be directly proportional to the hours taken hence we say that m=kh where m is miles, k is constant of proportionality and h is the number of hours. Making k the subject of the formula then $k=\frac {m}{h}$ . Substituting miles jogged with 3.5 miles and hours with 7/8 hours as given then

$k=\frac {3.5}{7/8}=4$

Therefore, the constant of proportionality is 4 miles per hour

8 0

3 years ago