The problem: My attempt: With |-9x^2| < 1, 9x < 1, x < 1/9 R = 1/9, I = (-1/9, 1/9) Not sure if this is correct. Thanks
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That's a good way to start: you recognized that is the sum of the geometric series and here r= -9x^2[/tex]. However, does NOT give 9x< 1, it gives so that
You're right, rookie mistake
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