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CBSE Class 10 Answered

In video lessons of the chapter real numbers 
part2 
there was a question
in which
 
If x=3q+2
Squaring both sides
x^2=(3q+2)
=9q^2+12q+4
 
We squared 3  3X3=9   
How did 12q come there
Asked by aayush.rattan | 11 Apr, 2016, 10:03: PM
answered-by-expert Expert Answer
open parentheses straight a plus straight b close parentheses squared equals straight a squared plus 2 ab plus straight c squared open parentheses 3 straight q plus 2 close parentheses squared equals open parentheses 3 straight q close parentheses squared plus 2 cross times open parentheses 3 straight q close parentheses open parentheses 2 close parentheses plus open parentheses 2 close parentheses squared space space space space space space space space space space space space space equals 9 straight q squared plus 12 straight q plus 4
Answered by Vijaykumar Wani | 13 Apr, 2016, 04:08: PM

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