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

Answer in Brief

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

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Solution

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

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

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

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

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APPEARS IN

RD Sharma Class 8 Maths
Chapter 6 Algebraic Expressions and Identities
Exercise 6.7 | Q 1.08 | Page 47
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