SOLUTION: factoring 64m2-81=0 I dont understand

Question 1088732: factoring 64m2-81=0
I dont understand
Answer by Boreal(15235) (Show Source): You can put this solution on YOUR website!
64m^2-81
every part of that is a perfect square.
subtraction makes it a difference of squares
a^2-b^2=(a+b)(a-b), the square root of each adding, multiplied by the same, subtracting.
Therefore, the factors are (8m+9)(8m-9)
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