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**Binomial Expansion problems!!!Please help me ASAP!!!**

1)Using binomial expand (3X +4)^4.can you please kindly explain your process.

2)Use the first 4 terms in the binomial expansion of (3x+4)^4 in the DESCENDING order of x to determine the approx. of 1.004^12.Can you please give me the way how to tackle a problem with descending powe.I know how to do ascending.IF it says first 3 terms in the ascending order i can easily get it by using the formula but if it is like ,'find the expansion of(>>blah blah)^20 in descending order,does this mean that we have to find the values all the way to 20 and get the last 3 terms or is there any easier way to do it?

3)EXpand using binomial expansion

( root3 - 2)^6

I'd like to thank in advance if anyone can help me do this.cheers.