Factorise: (2m + 5n)2 - 5(2m + 5n) - 14
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Step-by-step explanation:
(2m+5n)2 - 5(2m + 5n) - 14
4m + 10n - 10m - 25n - 14
=. - 6m - 15n - 14
=. - ( 6m +15n + 14)
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