The formula for the surface area S of a cube can be writte as;
[tex]S=6l^2[/tex]
Where;
[tex]l\text{ is the side length of the cube}[/tex]
From the attached image, the length of the side of the given cube is 5 units.
[tex]l=\text{ 5 units}[/tex]
So, the surface area can be calculated by substituting the value of the length into the formula.
[tex]\begin{gathered} S=6l^{2\text{ }}=6(5)^2 \\ S\text{ = 6}\times25 \\ S=150units^2 \\ \end{gathered}[/tex]
Therefore, the surface area of the cube
