Question

Find a • b.

a = 4i + 8j, b = -2i + 3j

Answer 1

a = 4i + 8j
b = -2i + 3j

you would want to try to cancel the J s.

Answer 2

Did this tip help you?

Answer 3

Why wouldn't I cancel the i's?

Answer 4

i is not a variable, the J is.

i is just a square root of -1.

Answer 5

Ohh, ok. Now I understand. Thank you!

Answer 6

Don't forget that you answer would be a times b,

Plug in the a and b values into a • b, when you find them.

Answer 7

So the answer would be (-8, 24)?

Answer 8

Finally equaling 16?

Answer 9

what did you get for a and b?

Answer 10

Yes 16, if you got the a and b right. I think you did.

Answer 11

Swell. Thanks for the help.

Answer 12

Anytime!