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give shortcut to this question . what is the coefficient of x^5 in ( 1+ 2x)^6 * (1 - x)^7

give shortcut to this question .


 what is the coefficient of x^5 in  ( 1+ 2x)^6 * (1 - x)^7

Grade:11

2 Answers

Neer Varshney
76 Points
10 years ago

Do not open this expression fully just consider only those in which u think power will come five.

Do a little bit of thinking in ur minds first like:

(1+2x)^6 * (1-x)^7

= (1+2x)^3(^2) * (1-x)7.

Then in the next step dont write the powers in which there is  no power 5.

 

jagdish singh singh
173 Points
10 years ago

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