so I get how to do the first step but I forgot how to factor it back? can someone explain how please, I want to be able to do it for all of them. thanks

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(1) Answers

GuadalupeHoyne

This problem is an example of difference of squares. 49 is a perfect square root.
So the answer is (x-7)²
Let me know if you need any more help with these kinds of problems.