Using Binomial Theorm to compute f

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November 1st 2012, 09:18 AM
flametag3

Using Binomial Theorm to compute f

Hey, I was hoping someone could check and tell me if I have done the below question correctly
The question asks that we use Binomial theorm and compute $(2- i)^5$

The answer I get is ( $-38 -119i$ ). I for some reason think it is incorrect, could someone double check for me please and thank you!
November 1st 2012, 09:41 AM
wasp

Re: Using Binomial Theorm to compute f

Quote:

Originally Posted by flametag3

Hey, I was hoping someone could check and tell me if I have done the below question correctly
The question asks that we use Binomial theorm and compute $(2- i)^5$

The answer I get is ( $-38 -119i$ ). I for some reason think it is incorrect, could someone double check for me please and thank you!

Yep. It's off.

$(2 - i)^5 = 2^5 - 5*2^4*i + 10*2^3*I^2 - 10*2^2*i^3 + 5*2*i^4 - i^5$

$=~(32-80+10) + (-80+40-1)i$

Does this help?

-Dan

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