Factor this Equation: x^2 + 6y - y^2 - 9 I figure, re-arrange. x^2 - y^2 + 6y - 9 Group. (x^2 - y^2) + (6y - 9) Factor. (x-y)(x+y) + 3(2y - 3) Re-arrange. 3(2y-3) + (x-y)(x+y)
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What about this one? (x-1)^2 - 1 I know it's a^2 - b^2, but I can't lay it out. Help please? EDIT: Nevermind, got it.
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