Question 761388
{{{(2^a) * (2^b) = 2^(a+b)}}}

{{{2^(a+b) = 128}}}

But, we know that 128 = 2*2*2*2*2*2*2 (7 times)

i.e.

{{{128 = 2^7}}}

So, a+b = 7

:)