Question

I HAVE A FINAL TOMORROW, PLEASE HELP ME

Simplify: 7i^2-i^3

Answer 1

Is it i as in \( \sqrt{-1}\)?

Answer 2

isn't I -1??????????????????

Answer 3

No \[i=\sqrt{-1}\]

Answer 4

oh sorry LOL I thought you said i^2

Answer 5

and yeah, you're right

Answer 6

so, how do you do this?

Answer 7

ok i^2=-1
and \[i^3=\sqrt{i*i*i}=\sqrt{i^2*i}=-1\sqrt{-1}=-1i\]

Answer 8

UHHHHHHHHHHHH
the answer is 7+i

Answer 9

hmmmm
7i-i=7(-1)-(-1i)=???
Watch ur signs

Answer 10

lol sorry the problem is 7i^4 not 7i^2

Answer 11

sorry

Answer 12

Ok gotcha lol

Answer 13

ok well i get how to get the 7 cause -1 * -1 is a positive, but I still don't get the the i is a positive as well you said it was -1i

Answer 14

nah cuz look
7(1)-(-1i)=7+i

Answer 15

OHHHHHHHHHHHHHHHHHHHHHHH
OK, I GET IT
THANK-YOU SO MUCH

Answer 16

7i^2-i^3

factor

= i^2(7-i)

use i^2=-1

= -(7-i)

= -7+i