Eric Nicholas K's answer to Irah Athirah's Secondary 3 A Maths Singapore question.
done
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Good evening Irah! Here are my workings for thie question. Let me know if my workings are unclear and I will explain the workings in greater detail.
Date Posted:
5 years ago
Actually, the part of the coefficient part is what Im still confuse on how to do that
How do you actually do that
Now, the general term of the expansion can be obtained using the formula.
The general term represents a specific term in the expansion (each with different values of r). Collectively, they form the full expansion.
The general term represents a specific term in the expansion (each with different values of r). Collectively, they form the full expansion.
The question asks for coefficient of x3. The word coefficient simply refers to the number attached to the x3. But for now, we treat coefficient of x3 as ‘term in x3’.
We must obtain the general term in the expansion and then collect all x together. Here, the general term has x raised to the power of r. To find the term in x3, we must set r to 3. Using this r = 3, we put back into the general term.
We must obtain the general term in the expansion and then collect all x together. Here, the general term has x raised to the power of r. To find the term in x3, we must set r to 3. Using this r = 3, we put back into the general term.
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