Find the Magnitude of V $\mathbf { v } = 5 \mathbf { i } - 4 \mathbf { j } - 8 \mathbf { k }$

Multiple Choice

Find the magnitude of v. $\mathbf { v } = 5 \mathbf { i } - 4 \mathbf { j } - 8 \mathbf { k }$

A) $\| v \| =$ $5 \sqrt { 2 }$
B) $\| v \| =$ $\sqrt { 89 }$
C) $\| v \| =$ $\sqrt { 41 }$
D) $\| v \| =$ $\sqrt { 2.72 }$
E) $\| v \| =$ $\sqrt { 105 }$