Question

Factor completely.

81x4 - 1

Answer 1

A. (3x + 1)(3x - 1)(3x + 1)(3x - 1) is this the answer

Answer 2

81x^4-1 is the problem

Answer 3

You can write it as:
\[(9x^2)^2 - (1)^2 \implies (9x^2-1)(9x^2+1) \implies (3x-1)(3x+1)(9x^2 + 1)\]

Answer 4

Because:
\[a^2 - b^2 = (a - b)(a + b)\]

Answer 5

so the answer is c

Answer 6

How can I know the answer??

Ha ha ha ha...

Answer 7

@jim_thompson5910 help please

Answer 8

Hey, did you provide the answer choices??

Then how can I say it is c or d or a or b?? In that sense I said that..

Answer 9

waterineyes is correct, there's no way to know what choice C is since you didn't write it

Answer 10

A. (3x + 1)(3x - 1)(3x + 1)(3x - 1)
B. (9x2 + 1)(9x2 - 1)
C. (9x2 + 1)(3x + 1)(3x - 1)
D. 9x2(9x2 - 1)

sorry

Answer 11

yes, it is C, and it's ok

Answer 12

Everything clear?? @Keandrap15

And sorry for that bad joke..

Answer 13

yes and its fine