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```
If a,b and c are in A.P A 2 +c 2 +4ac=2(ab+bc+ac). How to prove it .... a^3+b^3+6abc = 8b^3
If a,b and c are in A.PA2+c2+4ac=2(ab+bc+ac). How to prove it ....a^3+b^3+6abc = 8b^3

```
4 years ago

## Answers : (1)

Kunal Singh
36 Points
```							WE know that since a,b, c are in A.Ptherefore a+c/2=b              a+c=2b2(ab+bc+ac) can be written as 2ab+2bc+2ac=2b(a+c)+2ac=(a+c)(a+c)+2ac=(a+c)^2+2ac=a^2 +c^2+2ac +2ac=a^2+c^2+4ac..Hence proved
```
4 years ago
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• 101 Video Lectures
• Revision Notes
• Test paper with Video Solution
• Mind Map
• Study Planner
• NCERT Solutions
• Discussion Forum
• Previous Year Exam Questions