x²-1
(x+1)(x-1)
The expression x²-1 is a polynomial expression with one variable, x. It can also be written as (x-1)(x+1) using the difference of squares formula.
If asked to factor completely, we would write:
x²-1 = (x-1)(x+1)
If asked to evaluate the expression at a certain value of x, we would substitute that value in for x and simplify:
For example, if we were asked to evaluate x²-1 when x=3, we would write:
3²-1 = 9-1 = 8
Therefore, when x=3, the value of x²-1 is 8.
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