Determine the projection - vector, Mathematics

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Determine the Projection of b = (2, 1, -1) onto a = (1, 0, -2)

There is a requirement of a dot product and the magnitude of a.

a^→ • b^→ = 4 ||a^→||² = 5

the projection is then,

Proj_a_? b^→ = a^→• b^→ / (||a^→||²) (a^→)

= 4/5 (1, 0, -2)

= (4/5,0,- 8/5)

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