Factor x2−81
The factored form of x2−81 is (x−9)(x+9)
Step 1 :Factor the expression x2−81
Step 2 :Recognize this as a difference of squares problem. The difference of squares formula is a2−b2=(a−b)(a+b)
Step 3 :In this case, a=x and b=9 because 92=81
Step 4 :Rewrite x2−81 as (x−9)(x+9)
Step 5 :The factored form of x2−81 is (x−9)(x+9)