Question 1203c

Vectors I: Basics, Dot and Cross Products
Algebra III

Question

Given that ∣a∣=5,{|\mathbf{a}|=5,} b{\mathbf{b}} is a unit vector, and the angle between the the vectors is 60∘,{60^\circ,} what is the value of
(2a−b)⋅(5a)?(2 \mathbf{a} - \mathbf{b})\cdot(5 \mathbf{a})?

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