Binomial Expansion : C2 Edexcel June 2012 Q1 : ExamSolutions Maths Tutorials

[ExamSolutions_Maths]

Use the combinations method nCr rather than Pascal's triangle.

[ExamSolutions_Maths]

No, only when using the formula (1+a)^n=1+na+n(n-1)a^2/2!...

[emad]

so sir, we need to bring down the power of constant and add one to power of variable right?

[pokedude]

Would you still get full marks for using the alternative method? (as in 1+nx+n(n-1)/2!(x^2)+...)

[MrTehbigcheese]

and why have you included (-3x)^0 straight away, isnt this mentioned in the second term, to the power of 1?

[emad]

no don't worry I solved my problem but one more question, , how to do when we have a huge power like 30 ?

[MrTehbigcheese]

Dont we have to divide by 2 first? since the expansion only works when the first term is 1? Thought you did this in one of ur tutorials