## anonymous one year ago When using the binomial formula, which of the following is a correct step in the expansion of (x+y)^4?

1. Nnesha

allowed to use pascal's triangle ?

2. anonymous

yes

3. Nnesha

alright great so because exponent is 4 we need to look at 4th row |dw:1439831930473:dw| exponent of first star from 4 to 0 and 2nd one start from 0 to 4

4. Nnesha

|dw:1439832069688:dw|

5. Nnesha

for example if exponent is 5 exponent of first term start from 5 to 0 and 2nd term exponent from 0 to 5 like this (x+y)^5 $\rm \color{ReD}{1}(x)^5(y)^0+\color{reD}{5}(x)^4(y)^1+\color{reD}{10}(x)^3(y)^2+\color{Red}{10}(x)^2(y)^3+\color{reD}{5}(x)^1(y)^4+\color{ReD}{1}(x)^0(y)^5$

6. Nnesha

hmm thinking i'll try to explain better than that ,-,