It means that you can have infinitely many answers because it is true for all real numbers so it is always true.
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a tautology is a statement that is always true. For example p or not p is always true because one of the two is always true.
In Algebra, "is" means Equal (=).
In many schools, Geometry is considered one grade-level lower than Algebra 2. It goes Pre-Algebra, Algebra 1, Geometry, Algebra 2, and so on. Note that this is a generalization, and may not be true at your school.
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Boolean algebra is an area of algebra in which variables are replaced with 1 or 0 to indicate true or false. This form of algebra became the basis for binary computer programming used in digital electronic development.