Question

factorise
$(2x - y)^{2} - 9z^{2}$
$a^{2}-b^{2} = (a + b)(a - b)$
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Answer 1

Answer:

$(2x - y) {}^{2} - 9 {z}^{2} \\ = (2x - y) {}^{2} - {(3z})^{2} \\ \\ use \: \: your \: \: formula \: \: take \\ a = 2x - y \: \: \: \: and \: \: \: \:b = 3z \\ \\ = (2x - y + 3z)(2x - y - 3z)$