Question

Unit Vector

if PQ = 5i+2j+4k, then find
PQ?

Answer 1

Answer:

$3\sqrt{5}$

Step-by-step explanation:

Length of Vector PQ is,

$PQ = \sqrt{5^{2}+ 2^{2}+ 4^{2}} \\\\PQ = \sqrt{25 + 4 + 16 }\\\\ PQ = \sqrt{45}\\\\PQ = 3\sqrt{5}$