Let $\mathbf { a } = \langle 5 , - 1 , - 2 \}$ and $\mathbf { b } = \{ 1 , - 4,3 \}$ .(a) Compute $a + 2 b$ .(b) Find $| \mathbf { a } |$ .(c) Find the unit vector in the direction of b.

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The Answer of Let $\mathbf { a } = \langle 5 , - 1 , - 2 \}$ and $\mathbf { b } = \{ 1 , - 4,3 \}$ .(a) Compute $a + 2 b$ .(b) Find $| \mathbf { a } |$ .(c) Find the unit vector in the direction of b.

Let a=⟨5,−1,−2}\mathbf { a } = \langle 5 , - 1 , - 2 \}a=⟨5,−1,−2}

Let $\mathbf { a } = \langle 5 , - 1 , - 2 \}$