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Find the Following Product: (2x2 − 3) (2x2 + 5) - Mathematics

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ConceptConcept of Identity

Question

Find the following product:  (2x2 − 3) (2x2 + 5)

Solution

 Here, we will use the identity​ \[\left( x - a \right)\left( x + b \right) = x^2 + \left( b - a \right)x - ab\].

\[\left( 2 x^2 - 3 \right)\left( 2 x^2 + 5 \right)\]

\[ = \left( 2 x^2 \right)^2 + \left( 5 - 3 \right)\left( 2 x^2 \right) - 3 \times 5\]

\[ = 4 x^4 + 4 x^2 - 15\]

  Is there an error in this question or solution?

APPEARS IN

 RD Sharma Solution for Mathematics for Class 8 by R D Sharma (2019-2020 Session) (2017 to Current)
Chapter 6: Algebraic Expressions and Identities
Ex. 6.7 | Q: 1.08 | Page no. 47

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Solution Find the Following Product: (2x2 − 3) (2x2 + 5) Concept: Concept of Identity.
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