Hi,  

(a + 5)^3 = (a+5)(a^2 + 10a + 25) 

          = a(a^2 + 10a + 25) +5(a^2 + 10a + 25)= a^3 + 15a^2 + 75a + 125 

According to the Bionomial Theorem:





 

Answer by stela09(1)   (Show Source): You can put this solution on YOUR website!
 problem:(a+5)^3



Solution:

(a+5)^3



 first you have to do is too cube the first term which is (a) then square the first term multiply it by the second term then multiply it by 3(15a^2). then square the second term multiply it by the first term and multiply it by 3 (75a) after that cube the last second term (125)



a^3+15a^2+75a+125( this is the answer) 



i hope this help u!!