0 reads0 ratings0 helpful
Which of the following expressions is a difference of two perfect squares and can therefore be factorised into a product of conjugate binomials?
Advertisement
Answer and explanation
Correct answer: \(4x^2-25\)
Since \(4x^2=(2x)^2\) and \(25=5^2\), it is a difference of squares: \((2x-5)(2x+5)\). Option B is a perfect-square trinomial. Exam tip: check whether both terms are perfect squares first.
Frequently asked questions
What is the correct answer to this question?
\(4x^2-25\)
Why is this the correct answer?
Since \(4x^2=(2x)^2\) and \(25=5^2\), it is a difference of squares: \((2x-5)(2x+5)\). Option B is a perfect-square trinomial. Exam tip: check whether both terms are perfect squares first.
Which subject and chapter does this question cover?
This is a Class 9 Mathematics question. Chapter: Exploring Algebraic Identities. Topic: Factorisation.
Student feedback
Was this question useful?
Was this question useful?
👍 0 Helpful 👎 0 Not helpful
Difficulty
Easy0%
Medium0%
Hard0%
Was the explanation clear?
Yes 0% No 0%
0 responsesStudent Reviews
No published reviews yet.
Advertisement