Question

Which of the following is a polynomial with roots 5, 4i, and −4i?
f(x) = x3 − 5x2 + 20x − 16
f(x) = x3 − 5x2 + 16x − 80
f(x) = x3 − 20x2 + 5x − 16
f(x) = x3 − 16x2 + 80x − 5

Answer 1

give me a sec will help u out

Answer 2

Thank you

Answer 3

B.

Answer 4

Can you tell me how you got that?

Answer 5

okay when we do this just bring down the 5. 4*4=16 so this how we got 16 and we just multiply 5*4*4 which equals 80. does that make sense

Answer 6

Ohhh yes that does make sense! Could you help me with another?

Answer 7

for sure

Answer 8

Which of the following is a polynomial with roots 4, 6, and −7?
f(x) = x3 − 3x2 − 24x + 42
f(x) = x3 − 3x2 − 46x + 168
f(x) = x3 − 24x2 − 42x + 46
f(x) = x3 − 24x2 − 46x + 168

I was gonna do this one based of the answer you gave me from the last one but I guess you have to do this one differently?

Answer 9

this is a little different u are still multiplying all the number 4,6 &7 to get 168 but the difference is you will multiply 4*6= 24 so D is our I mean your answer lol

Answer 10

I was thinking it was D but I just wanted to see what you said haha thanks so much

Answer 11

anytime
hayz, u sound like a nice girl, don't know why anyone would not want to help u.

Answer 12

One more please? haha last one I promise!

Answer 13

its okay bring it on lol

Answer 14

Which of the following represents the zeros of f(x) = x3 − 14x2 + 61x − 84?
7, 4, −3
7, 4, 3
7, −4, −3
7, −4, 3

Answer 15

wait the prone is written in stander form If the polynomial is written in the standard form
f(x) = x^3+ax^2+bx+c
then the sum of roots should be -a = +3 and the product of roots should be -c = -168.
So a = -3 and c = +168.

Therefore the answer is B. sorry

Answer 16

thank you!