What is g in this equation " G+10=20"

What is the product of the radical expression. (7-2square root) (8+2 square root)

Can someone me and do the problem plz so i can understand it more better

One of every 20 customers reports poor customer service on your company’s customer satisfaction survey. you have just created a new process that should cut the number of poor customer service complaints in half. what percentage of customers would you expect to report poor service after this process is implemented? 1.) 5% 2.) 10% 3.) 2% 4.) 2.5%