Answer
24$c^{4}$+72$c^{2}$+54
Work Step by Step
Formula surface area of a cube: 6$a^{2}$
Plug in the value of a : 6$(2c^{2}+3)^{2}$
Simplify: 6 ($2c^{2}$+3)(2$c^{2}$+3)
FOIL method: 6[($2c^{2}$)($2c^{2}$)+($2c^{2}$)(3)+(3)(2$x^{2}$)+(3)(3)]
Simplify: 6(4$c^{4}$+6$c^{2}$+6$c^{2}$+9)
Combine like terms: 6(4$c^{2}$+12$c^{2}$+9)
Distribute 6 to every term in the parenthesis: 24$c^{2}$+72$c^{2}$+54
