Factorise: Evaluate

Question:

Factorise:
Evaluate {(405)2 − (395)2}.

Solution:

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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