Question:
Factorise:
Evaluate {(7.8)2 − (2.2)2}.
Solution:
We have:
$\left\{(7.8)^{2}-(2.2)^{2}\right\}=(7.8+2.2)(7.8-2.2)$
$=(10 \times 5.6)$
$=56$
$\therefore\left\{(7.8)^{2}-(2.2)^{2}\right\}=56$
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