Formula use: \left(a+b\right)^3=a^3+3.a^2.b+3.a.b^2+b^3
Explanation
Here, given expression is : 105
Now, we find the cubes with the help of formula :
\left(100+5\right)^3
\rightarrow\left(100\right)^3+3.\left(100\right)^2.5+3.100.\left(5\right)^2+\left(5\right)^3
\rightarrow 1000000+150000+7500+125
\rightarrow 1157625
Ans: 1157625 .