Question
How is ( x + y )n obtained from (x + y)n-1
Hint:
, where n ≥ 0 is called the binomial expansion of 
.
We are asked to find how can be obtained from 
.
The correct answer is: = 1736
Step 1 of 1:
The binomial expansion of
Multiply then expansion by ( x + y ) , that is:
Multiply then expansion by ( x + y ) , that is:
You could also get the value of from by just multiplying a ( x + y) with .
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This can also be done by finding the cube of each values and adding them. But that might be time consuming. Hence, we use these identities.
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We use identities to speed up the process of multiplication and simplification. There are some basic polynomial identities that you need to by heart.
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