Question

The magnitude of a vector r = 3 i + 6 + 2k:

​

Answer 1

Answer:

The required vector r=t(a+b),t is a scalar 

⇒r=t[91(7i−4j−4k)+31(−2i−j+2k)]

=9t(i−7j+2k)

Since r=36⇒∣r∣2=54

⇒81t2(1+49+4)=54⇒t2=81⇒t=±9

Hence, r=±(i−7j+2k)

Explanation:

I think its help you ✌

pls follow me ♥️

make as branlist answer ❣

.

..

...

☆☆☆☆☆

Answer 2

[r]=√3^2+6^2+2^2

=√9+36+4

=√49

=7.

hope it helps.

please please mark me as brainliest and follow me.....