Answer:
Hey there.. I will be more than happy to help you today.. :) 
 
A Number squared decreased by ten 
 
We will do this with steps:- 
 
Step 1 - "A number ". So, Let's say any number be x 
 
Step 2 - "A number squared". Our number x is squared i.e. x² 
 
Step 3 - "A number squared" ( i.e. x² ) is decreased by ten 
x² - 10 
 
This is your answer. 
Hope this helps you :) 
Explanation:
Hope you got helped