Question

Complex zero question! check my answer please?

Answer 1

@ryanvarghese12790 it has to be either C or D..do you know the answer?

Answer 2

@amistre64 another question similar to the other. I cant tell if its C or D.

Answer 3

rule of sign, how many possible negative roots do we have?

Answer 4

no negative roots, so that leaves us with x=9 as the only reasonable answer.

divide out the x=9 and see whats left over.

Answer 5

1 -9 9 -81
0 9 0 81
9 1 0 9 0

x^2 + 9 = 0 gives the complex parts

Answer 6

yes so we know 9 is a root. i knew that. i just dont know how to find the other number.

Answer 7

ok, D is good, sqrt(-9) is 3i

Answer 8

how do you find the 3i?

Answer 9

i worked a synthetic division method to determine what we had left over when we divide out x-9

Answer 10

x^2 + 9 = 0 is whats left, solve for x

Answer 11

ohh okay, thank you!

Answer 12

yw