Question

How do you find a=b+2c given b=<6,3> and c=<-4,8>?

Answer 1

<-2,19>

Explanation:

I'm interpreting what you wrote as the specification of two vectors.

You need a scalar multiple of vector c, for this just multiply each component by 2:

2c = <-8,16>

Then the vector sum is found by simply adding the respective components...

b + 2c = <6,3> + <-8,16> = <-2,19>