Question

Expand (x+3)^6

Expand (4x-3y)^4

Expand Identify the third terms in the expansion (7x-2y)^3

Answer 1

Ummm are you familiar with Pascal's Triangle? :D

Answer 2

Yes @zepdrix

Answer 3

This is how we expand out a binomial:
\[\large (x+y)^5=ax^5y^0+bx^4y^1+cx^3y^2+dx^2y^3+ex^1y^4+fx^0y^5\]
See how the powers on x count DOWN as we move to the right,
and the powers on y count UP til we reach 5.

a, b, c, d, e, and f are the coefficients that we need to get from Pascal's Triangle.

Sorry about the delay :( The site keeps crashing on me today.