SOLUTION: Hello, I need help. Use the “difference of squares” rule to factor the following expression: 25-9z^2

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Question 490665: Hello, I need help.
Use the “difference of squares” rule to factor the following expression:
25-9z^2
Answer by nerdybill(7384) About Me  (Show Source):
You can put this solution on YOUR website!
25-9z^2
can be written as:
(5)^2 - (3z)^2
(difference of squares)
we can now factor as:
(5-3z)(5+3z)