Question

seven less than a number squared (im working on translating)

Answer 1

A letter or any other symbol may be used to represent an arbitrary number. For example, let's use the letter M. Since M equals "a number", then, "a squared number" may be represented as:

$M^2$

Seven less than a number squared, is the number squared minus 7, so:

$M^2-7$

is a correct representation of "seven less than a number squared".