Question

Quick question?
Find a ⋅ b.

a = 8i + 6j, b = 4i + 5j

Answer 1

Do the ones with the letters look like this: <32, 30>, or this: 62?

Answer 2

@surjithayer

Answer 3

a.b is a scalar quantity.
a.b=(8i+6j)(4i+5j)=(8)(4)+(6)(5)=32+30=62

Answer 4

Awesome. Thanks. :D

Answer 5

i.i=i^2=1
i.j=0

Answer 6

I thought i^2 was -1? Or is that only Algebra?

Answer 7

i and j are unit vectors.
\[i.i=\left| i \right|\left| i \right|\cos 0=(1)(1)(1)=1\]

Answer 8

that is iota

Answer 9

iota?

Answer 10

(iota)^2=-1

Answer 11

Ohhh. That's the real name of that thing.