Question

If vector A = (-3.0, -4.0) and vector B = (+3.0, -8.0), what is the magnitude of vector C = A -B?

Answer 1

answers are:
a. 144
b. 7.2
c. 13
d. 16

Answer 2

I think it is 7.2

Answer 3

\[C=A-B\]
Subtract component by component
\[C=(-3-(3), -4-(-8))\]
\[C=(-6, -12)\]
magnitude of C
\[|C|=\sqrt{(-6)^2+(-12)^2}\]
Could you solve this?

Answer 4

c is = -6, 4 ?

Answer 5

because of the -4-(-8)= 4

Answer 6

oops sorry
\[|C|=\sqrt{(-6)^2+(4)^2}\]

Answer 7

yeah you're right, it's 7.2