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OpenStudy (anonymous):
Factor completely: 81x4 – 1 A. (3x2 + 1)3(3x – 1) B. (9x2 + 1)(3x + 1)(3x – 1) C. (9x + 1)(9x – 1) D. (9x2 + 1)(9x2 – 1)
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OpenStudy (anonymous):
Take the sq. root of 81 and x^4 which = 9x^2. Sq root of 1 =1. Difference of perfect squares (a+b)(a-b).
OpenStudy (anonymous):
@Princezz
OpenStudy (anonymous):
It was B.
OpenStudy (anonymous):
But thanks anyways :D
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