Question

Factorise
$4p {}^{2} - 9q {2}$
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Answer 1

⇒(2p)^2 −(3q)^2

[a^2 −b^2=(a+b)(a−b)]

⇒(2p+3q)(2p−3q)

Answer 2

$4p {}^{2} - 9 {q}^{2} \\ = > { (2p)}^{2} - {(3q)}^{2} \\ = > (2p + 3q)(2p - 3q)$