what is 3 to the power of 5+2 x 4 tothe power of 5+2

Lets go step by step:

 

First we add the numbers so we got:

 

3 to the power of 13 to the power of 7.

 

From there we get:

 

13⁷ = 62748517

 

And then:

 

3^62748517 ≈ ∞

 

So, the numer you are looking for would be close to infinity. Have a nice day :)