Question
A student says that the expansion of the expression has seven terms. Describe and correct the error the student may have made ?
Hint:
The expansion of the expression would have n+1 terms. The binomial expansion is
.
We are asked to describe and correct the error the student has made while expanding and getting only seven terms.
The correct answer is: 7 terms.
Step 1 of 2:
The given expression is . Here, the values of . The value of n=7
Step 2 of 2:
Substitute the values in the binomial expansion to get the terms:
Thus, we get 8 terms in the expansion. The student may have considered n=6 to get an expansion of 7 terms.
Thus, we get 8 terms in the expansion. The student may have considered n=6 to get an expansion of 7 terms.
The answer can be found the Pascal’s triangle as well. The expansion of an expression has n+ 1 term.
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