This formula has me stumped! Could somebody please explain the steps and what goes on in between (if there is something)? Note- I don't know how to do subscripts, so bear with me!
x2 + 2x -a(a + 2)
=(x - a)[x + (a + 2)]
=(x - a)(x + a + 2)
Mostly it's how they get from step 1 to step 2 that confuses me. Thanks in advance!
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