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OpenStudy (anonymous):
Factor Completely: 4x^2 − 81 (4x − 9)(x + 9) (2x + 9)(2x + 9) (2x + 9)(2x − 9) (2x − 9)(2x − 9)
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OpenStudy (ankit042):
(a^2-b^2) = (a+b)(a-b) Now you can apply this and get your answer!
OpenStudy (uri):
Y U NO TRY TO DO IT..OMGG
Directrix (directrix):
This problem illustrates one of the basic factoring patterns: the difference of two squares. 4x^2 − 81 = (2x)² - (9)² = ?
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