Question

i don't know when to use pascal triangle and binomial expansion in the exam

Answer 1

You use the Pascal Triangle to preform a binomial expantion
(x + y)^0 = 1
(x + y)^1 = x + y
(x + y)^2 = x^2 + 2xy + y^2
(x + y)^3 = x^3 + 3yx^2 + 3xy^2 + y^3
do you see how it's used

Answer 2

no

Answer 3

the coefficients is the sum of those above, notice the total power across the sum is always the exponent (x+y)^n

Answer 4

oh ok

Answer 5

As x^n goes to x^0 and y goes from y^0 to y^n, the coefficients are that of the Pascal Triangle Line n

Answer 6

thnks