Factorise:Evaluate {(7.8)2 − (2.2)2}.
We have:
$\left\{(7.8)^{2}-(2.2)^{2}\right\}=(7.8+2.2)(7.8-2.2)$
$=(10 \times 5.6)$
$=56$
$\therefore\left\{(7.8)^{2}-(2.2)^{2}\right\}=56$
Leave a comment
All Study Material
