The problem
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I can`t undestand from 2x^2 - 2x - 1 to 2x^2 -2x + x-1.
I also can't understand from 2x(x^2-1-1) + (x-1) to (x-1)(2x+1)
Answer provided by our tutors
You can obtain an explanation for any step by clicking on it. Please note that you cannot click on the very first expression, which is the original problem.
For the second, we just pull (x-1) in front of the brackets:
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