Question

a=3i+2j-5k and B=i+j+2k,find A+2B​

Answer 1

A=3i+2j-5k and B=i+j+2k,find A+2B

$A= \sqrt{ {3}^{2} + {2}^{2} + {5}^{2} } = \sqrt{9 + 4 + 25} \\ A = \sqrt{38}$

$B = \sqrt{ {1}^{2} + {1}^{2} + {2}^{2} } = \sqrt{6}$

$So A+2B = \sqrt{38} + 2 \sqrt{6}$

Hope helps u

That is magnitude