wiz-icon
MyQuestionIcon
MyQuestionIcon
1
You visited us 1 times! Enjoying our articles? Unlock Full Access!
Question

If a=^i+^j and b=^j+2^k. Find (ab).(a+2b).

A
6
No worries! We‘ve got your back. Try BYJU‘S free classes today!
B
6
No worries! We‘ve got your back. Try BYJU‘S free classes today!
C
9
No worries! We‘ve got your back. Try BYJU‘S free classes today!
D
9
Right on! Give the BNAT exam to get a 100% scholarship for BYJUS courses
Open in App
Solution

The correct option is D 9
Given, a=^i+^j and b=^j+2^k
ab=(^i+^j)(^j+2^k)=^i+2^j2^k
and a+2b=(^i+^j)+2(^j+2^k)=^i^j+4^k
Thus, (ab).(a+2b)=(^i+2^j2^k).(^i^j+4^k)
128=9

flag
Suggest Corrections
thumbs-up
0
Join BYJU'S Learning Program
similar_icon
Related Videos
thumbnail
lock
PHYSICS
Watch in App
Join BYJU'S Learning Program
CrossIcon