Hello,
Volume of the cube=
s^3 where s represent side of the cube
Apply all the information that we had into this problem:
343=s^3
To find the side, cubic root it to get:
s=7 cm.
To find S.A=
s^2×6
=7^2×6
=49×6
=294 cm square. As a result, the surface area of the cube is 294 square cm. Hope it help!