Question

help with binomial theorem? expand (x+3)^4

Answer 1

which part... is causing you problems..?

Answer 2

the expansion, i missed the lesson at school so i really dont understand

Answer 3

ok... so the 4th power... the coefficients come from pascal's triangle


so start with

\[1 \times x^{4-0}(3)^{0} + 4 \times(x)^{4 -1}(3)^{1} + 6\times x^{4-2}(3)^{2}+...\]

you just need to continue the pattern... into you have x^0

then just evaluate the powers of 3 and multiply by the coefficient...

hope this makes sense