Discrete Math Binomial Theorem

sita

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dhD8RqqURueqc69ff27Q-Q.png

Please could someone help me the way to approach this?
 
dhD8RqqURueqc69ff27Q-Q.png

Please could someone help me the way to approach this?

Start by writing out the binomial theorem itself. Then look for a part that you can turn into a 2, and a part that you can turn into -1 (probably by merely assigning a value to a variable).

Then the result may be nearly obvious.

If you don't see it, then show us your version of the theorem, and we can offer another hint based on how you write it.
 
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