Question

Plzzzz help mehh its scientific notation and im putting alot o point for it

Answer 1

$(7.2\cdot10^7)^2=7.2^2\cdot(10^7)^2=51.84\cdot10^{14}=\boxed{5.184\cdot10^{15}}=\\ \boxed{5,184,000,000,000,000}$