Using pascal triangle solve (x+2y)4?
#(x+2y)^4#
1 Answer
Apr 19, 2018
Use the 4th row of pascal triangle.*
Explanation:
Remember how the Pascal triangle looks.
We start at the top: write 3 one in a triangle shape, then sum each two numbers of previous line.
1
1 1
1 (1+1) 1
1 (1+2) (1+2) 1
The 4th row is:
* numeration of rows *
This numbers are binomial coefficient:
in your case: