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OpenStudy (anonymous):
Factor completely 81x2 - 4 Choose one answer. a. (2x - 9)(2x - 9) b. (2x - 9)(2x + 9) c. (9x - 2)(9x - 2) d. (9x - 2)(9x + 2)
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OpenStudy (anonymous):
I got D
OpenStudy (anonymous):
sound right?
OpenStudy (anonymous):
a² - b² = (a + b)(a - b) so in this case 81x² - 4 = (9x + 2) (9x - 2)
OpenStudy (ryan123345):
Yes, D is correct! :)
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