Factorise:Evaluate {(405)2 − (395)2}.
We have:
$\left\{(405)^{2}-(395)^{2}\right\}=(405+395)(405-395)$
$=(800 \times 10)$
$=8000$
$\therefore\left\{(405)^{2}-(395)^{2}\right\}=8000$
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