# Factorize Each of the Following Expression: (2x + 1)2 − 9x4 - Mathematics

Sum

Factorize each of the following expression:
(2x + 1)2 − 9x4

#### Solution

$(2x + 1 )^2 - 9 x^4$
$= (2x + 1 )^2 - (3 x^2 )^2$
$= [(2x + 1) - 3 x^2 ][(2x + 1) + 3 x^2 ]$
$= ( - 3 x^2 + 2x + 1)(3 x^2 + 2x + 1)$
We can factorise the quadratic expressions in the curved brackets as:
$( - 3 x^2 + 3x - x + 1)(3 x^2 + 2x + 1)$
$= \left\{ 3x( - x + 1) + 1( - x + 1) \right\}(3 x^2 + 2x + 1)$
$= ( - x + 1)(3x + 1)(3 x^2 + 2x + 1)$
$= - (x - 1)(3x + 1)(3 x^2 + 2x + 1)$

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#### APPEARS IN

RD Sharma Class 8 Maths
Chapter 7 Factorization
Exercise 7.5 | Q 37 | Page 17