I'm working on an exercise, not sure if I am posting in the right place though... first time on this website

Vector A = 3i - 2j + k

Vector B = -2i + 5j + 4k

Vector C = -4i + j + -2k

Vector D = 2i - j + 4k

determine (alpha), (beta), and (gamma) such that Vector D = (alpha)VA + (beta)VB + (gamma)VC

I have no idea where to start on this, is should I be doing scalar projections or something with unit vectors? Have I missed something obvious??

I got really lost and none of my answers came out right (I know the solution, just not how to get to it)

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