A community for students.
Here's the question you clicked on:
 0 viewing
anonymous
 one year ago
Factor completely:
81x4 – 81
A.
(9x2 + 9)(3x + 3)(3x – 3)
B.
(3x + 3)2(3x – 3)2
C.
(3x + 3)(3x – 3)
D.
(9x2 + 9)(9x2 – 9)
anonymous
 one year ago
Factor completely: 81x4 – 81 A. (9x2 + 9)(3x + 3)(3x – 3) B. (3x + 3)2(3x – 3)2 C. (3x + 3)(3x – 3) D. (9x2 + 9)(9x2 – 9)

This Question is Closed

SolomonZelman
 one year ago
Best ResponseYou've already chosen the best response.1\(81x^4 – 81\) \(81(x^4 –1 )\) \(81(~(x^2)^2 –1^2 )\) \(81(x^2 –1 )(x^2+1)\) and then the last step...

SolomonZelman
 one year ago
Best ResponseYou've already chosen the best response.1this is how I would go about this problem, with no need to remember any identities with the 4th power.

anonymous
 one year ago
Best ResponseYou've already chosen the best response.0thanks @SolomonZelman

SolomonZelman
 one year ago
Best ResponseYou've already chosen the best response.1not done yet, you need one more step to complete this problem

SolomonZelman
 one year ago
Best ResponseYou've already chosen the best response.1oh, they did it differently, they didn't take 81 out....

SolomonZelman
 one year ago
Best ResponseYou've already chosen the best response.1oh, typo in the rule ok, so 81•x\(^4\)=3\(^4\)•x\(^4\)=(3x)\(^4\) this is what you get from your initial expression: (3x)\(^4\)3\(^4\) then you can factor it, using a rule a\(^4\)b\(^4\)=(ab)(a+b)(a²+b²)

SolomonZelman
 one year ago
Best ResponseYou've already chosen the best response.1your a is 3x your b is 3
Ask your own question
Sign UpFind more explanations on OpenStudy
Your question is ready. Sign up for free to start getting answers.
spraguer
(Moderator)
5
→ View Detailed Profile
is replying to Can someone tell me what button the professor is hitting...
23
 Teamwork 19 Teammate
 Problem Solving 19 Hero
 Engagement 19 Mad Hatter
 You have blocked this person.
 ✔ You're a fan Checking fan status...
Thanks for being so helpful in mathematics. If you are getting quality help, make sure you spread the word about OpenStudy.