Question

What are the possible number of positive real, negative real, and complex zeros of
f(x) = –7x4 – 12x3 + 9x2 – 17x + 3?
Answer:

A)Positive Real: 1
Negative Real: 3 or 1
Complex: 2 or 0

B)Positive Real: 3 or 1
Negative Real: 2 or 0
Complex: 1

C)Positive Real: 3 or 1
Negative Real: 1
Complex: 2 or 0

D)Positive Real: 4, 2 or 0
Negative Real: 1
Complex: 0 or 1 or 3
This the last question like this, help me please:)

Answer 1

descartes rule of sign for this one
http://www.purplemath.com/modules/drofsign.htm

Answer 2

three changes of sign in your example,
\[–7x^4 – 12x^3 + 9x^2 – 17x + 3\]
\[–7x^4 – 12x^3_{\text{ here }} + 9x^2_{\text{ here }} – 17x_{\text{ here }} + 3\]

Answer 3

so possible positive roots: 3 or 1

Answer 4

\[f(-x) = –7(-x)^4 – 12(-x)^3 + 9(-x)^2 – 17(-x) + 3\]
\[f(-x) = –7x^4 + 12x^3 + 9x^2 + 17x + 3\] this has one change in sign

Answer 5

so one possible negative root. degree is 4, so there are 4 roots in total
Positive Real: 3 or 1
Negative Real: 1
Complex: 2 or 0

Answer 6

Okay thank you very much!:))

Answer 7

yw
btw the link i sent has a brief clear explanation with examples, if you have to take a test on this it is easy enough with a little practice

Answer 8

okay thank you, i am understanding bits and pieces of this lesson:)

Answer 9

Anatomy Tutorial: Endocrine Functions of Other Organs

Answer 10

Anatomy Tutorial: The Adrenal Glands

Answer 11

grignard + ester mechanism check

Answer 12

acidity of carbonyl compounds question

Answer 13

Yuriu2019s sister Karina is 12 years old. In the equation below, y represents Yuriu2019s age in years.

Answer 14

Music

Answer 15

A rat poison with an LD50 of 6 mg/kg of body weight would be expected to cause more harm to the skin and eyes than a product with an LD50 of 600 mg/kg.

Answer 16

A substance found in drinking water thought to be causing suspicious deaths would be analyzed in a ________.

Answer 17

The alcohol test done with a breathalyzer is only used for screening because its readings are not well related to the alcohol content in the lungs and blood

Answer 18

The combined use of heroin and alcohol _____.

does not affect driving ability
ma

Answer 19

Mike and Matt went down into the , dusty basement to look for the old baseball cards.

Answer 20

Hello!is there any who can help me
in electromagnetic theory?

Answer 21

PLS HELP!!!

Answer 22

Forensics

Answer 23

Which physical state of matter has the most kinetic energy?
A. plasma
B. gas
C.

Answer 24

Maths

Answer 25

PLS HELP!!!

Answer 26

If a gas in a closed container is pressurized from 15.0 atm to 16.0 atm and its original temperature was 25 u00b0C, what would be the final temperature of t

Answer 27

2H2 + O2u00e02H2O
How many water molecules are created when 32 grams of oxygen react completely with 4 grams of hydrogen?
A.

Answer 28

f