Question

Help with multiplying vectors

Answer 1

v= 9i-5j, find -2||v||^2

Answer 2

sqrt((9)^2+(-5)^2)
sqrt106
106*-2= -212

Answer 3

\[||v||=\sqrt{(9)^2+(-5)^2}\]

Answer 4

\[||v||^2 = \left( \sqrt{(9)^2+(-5)^2} \right)^2 = \left( \sqrt{81+25} \right)^2 = \left( \sqrt{106} \right)^2 = 106\]

Answer 5

\[-2 \times 106 = -212\]

Answer 6

Good :)

Answer 7

Thank you for checking :D

Answer 8

Your welcome ^.^