In ( (a+2b+c)^2 ), where does (4b^2) come from?
Answer and explanation
Correct answer: From \((2b)^2\)
In the expansion of a three-term square, the square of each individual term appears. Here, \((2b)^2=4b^2\), so option B is correct. \(2ac\) is a product term involving \(a\) and \(c\), not the source of \(4b^2\). Exam tip: when squaring a term, square its numerical coefficient as well.
Frequently asked questions
What is the correct answer to this question?
From \((2b)^2\)
Why is this the correct answer?
In the expansion of a three-term square, the square of each individual term appears. Here, \((2b)^2=4b^2\), so option B is correct. \(2ac\) is a product term involving \(a\) and \(c\), not the source of \(4b^2\). Exam tip: when squaring a term, square its numerical coefficient as well.
Which subject and chapter does this question cover?
This is a Class 9 Mathematics question. Chapter: Exploring Algebraic Identities. Topic: Algebraic identities.
Student feedback
Was this question useful?
👍 0 Helpful 👎 0 Not helpful
Yes 0% No 0%
0 responsesStudent Reviews
No published reviews yet.
