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Class 9 Mathematics Exploring Algebraic Identities Algebraic identitiesMediumLevel 62

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Which is the correct value of ( (5x+4)^2-(5x-4)^2 )?

Answer and explanation

Correct answer: (80x)

In ( (a+b)^2-(a-b)^2=4ab ), (a=5x) and (b=4), so (80x) is obtained. Exam tip: take the full (a).

Related tags

Identity Difference 80X Correct Calculation

Frequently asked questions

What is the correct answer to this question?

(80x)

Why is this the correct answer?

In ( (a+b)^2-(a-b)^2=4ab ), (a=5x) and (b=4), so (80x) is obtained. Exam tip: take the full (a).

Which subject and chapter does this question cover?

This is a Class 9 Mathematics question. Chapter: Exploring Algebraic Identities. Topic: Algebraic identities.

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