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```
sir i have a question in vector chapter that if vector a+b vector is equal to R vector and vector a+2b vector is perpendicular to vector a then find the value of b
sir i have a question in vector chapter that if vector a+b vector is equal to R vector and vector a+2b vector is perpendicular to vector a then find the value of b

```
3 years ago

Arun
25768 Points
```							Here we are given two lines a+ 2b and a which are inclined at 90 degrees.Thus applying dot product on these lines,a× (a+2b)=0a^2+2ab=0a^2=-2aba=-2bNow a+b=r-2b+b=rThus b+r=0. Or b=-r
```
3 years ago
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### Course Features

• 110 Video Lectures
• Revision Notes
• Test paper with Video Solution
• Mind Map
• Study Planner
• NCERT Solutions
• Discussion Forum
• Previous Year Exam Questions