book Maths Puzzle Numerical Ability

What is a number called that is raised to the second power?

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book Other Question

what is the function for all these number
-6,-5
-4,-4
-2,-3
0,-2
2,-1
4,0
6,1
8,2
they all have to have the same function 1. x+2x-4+5(2x-4)-2=13