Why is 2 to the 30th power times 4 equal to 2 to the 32nd power?

2^30 x 4  =     {we're using the rule   a^m * a^n = a^(m + n)  }   ....  so .....

2^30 x 2^2  =

2^(30 + 2) =

2^(32)

And there you are.....!!!