what is the projection of ( i + 2j+ 3k ) on ( i - 2j - 2k ) ?

Please help soon.

Thank you .

Question

what is the projection of ( i + 2j+ 3k ) on ( i - 2j - 2k )
?
Please help soon
Thank you

Anuradha Sharma · Accepted Answer

Here vector a→ =i^+2j^+3k^b→ =i^-2j^-2k^SO projection
of a on b is, =a→ b→b→=i^+2j^+3k^
i^-2j^-2k^i^-2j^-2k^=1-4-61+4+4=-99=-9=-3 unit