Answer:
g^8
Step-by-step explanation:
The "." means multiplication. Therefore take g as common.
But, for the powers its different.
When constants are being multiplied, the powers will be added together:
g^5 x g^3
=g^ 5+3
=g^8
If the constants were being added then the powers would hv been multiplied: g^5 + g^3
= g^5 x 3
=g^15
Similarly, if the constants were being divided then the powers would hv been substracted: g^5/g^3
=g^5-3
=g^2
And if the constants were being substracted the the powers would hv been divided: g^5 - g^3
=g^5/3
So, therefore ur answer is g^8.
Hope u understood :D