chutchinson256
19.08.2019 •
Mathematics
Factor completely: 81x^4 – 1
a. (9x + 1)(9x – 1)
b. (9x^2 + 1)(9x^2 – 1)
c. (3x^2 + 1)^3(3x – 1)
d. (9x^2 + 1)(3x + 1)(3x – 1)
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Ответ:
Ответ:
Using this: a²-b²=(a+b)(a-b)
81x^4-1=
(9x²)²-1=
(9x²-1)(9x²+1)= (in the bold half we use the formula again)
(3x+1)(3x-1)(9x²+1)
So the answer is D
Ответ:
hahahah
Step-by-step explanation: