Question

The surface area of a cube is $96c{m}^2$. What is the new surface area of the cube if the length of each edge the cube is doubled?

Answer 1

$6a^2=96$ (S.A of cube)

$a^2=16\Rightarrow a=4cm$

Now, $a^1=2\times a=4\times 2=8cm$

$\therefore$ New S.A = $6\times 8^2=384c{m}^2$