so, can you solve 5^4 x 5^2? well, it’s pretty simple. so, 5^4 x 5^2 have the same base, so you just add the powers.so,5^4 x 5^2 = 5^4+2 = 5^6 or 5x5x5x5x5x5. or 15,625. but if the base is different,(like 5^3+7^3) then you will have to figure out the exponent, then multiply. (so, 5^3+7^3= (5x5x5)x(7x7x7) or 125×343! or 42,875!) so what will be 7^128 x 87^8? well… 4.883185×10^123 or 4883185000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000!argh! oh no! ahh……

sorry, it was too big of a number!