NCERT Class 9 Solutions: Polynomials (Chapter 2) Exercise 2.5 – Part 2

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Q-4 Expand each of the following using suitable identities:

Solution:

Mathmatical identities for squares of trinomials

Trinomial Square Formulas

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Using identify

Here

Using identify

Here

Using identify

Here

Using identify

Here

Using identify

Here

Using identify

Here

Q-5 Factorize:

Solution:

Using identify

Using identify

Q-6 Write the following cubes in expanded form:

Solution:

Important identities with cubes

Most Important Identities Involving Cubes

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Using identify

Using identify

Using identify

Using identify

Q-7 Evaluate the following using suitable identities:

Geometric interpretation of a + b cubed

Illustrating a + B Cubed

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Solution:

Using identity

Using identity

Using identity

Q-8 Factorize each of the following:

Solution: