Question

find specified scalar: u=-8i+5j and v=-11i-6j; find u*v

Answer 1

Dot Product

if u = ai + bj

and v = ci + dj

then

u dot v = a*c + b*d

Answer 2

Example:

u = 2i - 3j
v = 7i + 5j

u dot v = 2*7 + (-3)*5

u dot v = 14 - 15

u dot v = -1

Answer 3

right =(-8)(-11) + 5(-6) which equals -62; but what is the specified scalar?

Answer 4

(-8)(-11) + 5(-6) = 58, not -62

Answer 5

the specified scalar would be 58

Answer 6

scalar is just a single number (ie not a vector)

Answer 7

AH!! Thank you!!

Answer 8

you're welcome