Question

ax²-25ax+84a factorise the following​

Answer 1

$\: \: \: a {x}^{2} - 25ax + 84a \\ = > a {x}^{2} - 21ax - 4ax + 84a \\ = > ax(x - 21) - 4a(x - 21) \\ = > (ax - 4a)(x - 21) \\ = > a(x - 4)(x - 21)$

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