3-2r+5=2-8/3 is simplified to what?

Pls! does anybody know a shortcut for answering these types of questions in the future?

The sum of the squares of two numbers is 8 . the product of the two numbers is 4. find the numbers.

Suppose you are choosing a 6-digit personal access code. this code is made up of 4 digits chosen from 1 to 9, followed by 2 letters chosen from a to z. any of these digits or letters can be repeated. find the total number of personal access codes that can be formed. 492,804 341,172 39,917,124 4,435,236