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**Find values of "a" making one vector parallel to the other**

## Homework Statement

Find the value(s) of a making vector v = 4ai - 2j, parallel to vector w = a^2i +4j

## Homework Equations

P= (a dot b/ magnitude b^2) (bi, bj)

## The Attempt at a Solution

I can plug and chug, but at what point do you solve for a?