Question

Which of the following is a polynomial with roots 2, -2i, and 2i ?
Choose one answer.
A. x3 - 4x2 + 4x - 16
B. x3 + 4x2 + 4x + 16
C. x3 + 2x2 + 4x + 8
D. x3 - 2x2 + 4x - 8

Answer 1

the one that looks like
\[(x-2)(x^2+4)\] after you multiply out

Answer 2

do you have calculator ???

Answer 3

no i dont

Answer 4

you don't need one, just multiply
btw of course you have a calculator! you are on a computer

Answer 5

no if you have calculator you can get half help from it
and yeah good point about computer cal.
but i asking ti84 one real in hands

Answer 6

i picked c, is that correct?

Answer 7

http://www.wolframalpha.com/input/?i=%28x-2%29%28x^2%2B4%29

Answer 8

c is usually correct
is it \[x^3-2 x^2+4 x-8\]?

Answer 9

yes that is correct

Answer 10

thank you! could you guys help me with this problem?

Which of the following is a polynomial with roots - square root of 5, square root of 5, and -3 ?
Choose one answer.
A. x3 - 2x2 - 3x + 6
B. x3 + 2x2 - 3x - 6
C. x3 - 3x2 - 5x + 15
D. x3 + 3x2 - 5x - 15

Answer 11

\[(x+3)(x-\sqrt5)(x+\sqrt5)=(x+3)(x^2-5)\]

Answer 12

thank you :) this is the last question!

What are the possible number of positive, negative, and complex zeros of f(x) = -x6 + x5- x4 + 4x3 - 12x2 + 12 ?
Choose one answer.
A. Positive: 4, 2, or 0; Negative: 2 or 0; Complex: 6, 4, 2, or 0
B. Positive: 3 or 1; Negative: 3 or 1; Complex: 4, 2, or 0
C. Positive: 5, 3, or 1; Negative: 1; Complex: 4, 2, or 0
D. Positive: 2 or 0; Negative: 2 or 0; Complex: 6, 4, or 2

Answer 13

do you know how to factor polynomial ???

Answer 14

no i dont. im really bad at math and i take online classes so we just get problems with no examples on how to do things :/

Answer 15

so you should learn this i don't know if you got above two
for last one what is your highest degreee

Answer 16

do you know about degree ??? :)

Answer 17

exponent known as degree so what is highest degree