+0  
 
0
352
3
avatar+556 

Factor completely: \(x^4-81\)

I got: \((x^2+9)(x^2-9)\)

What did I miss?

 Nov 3, 2017
 #1
avatar+96189 
0

(x ^2 + 9)  ( x^2 - 9)

 

So far...so good...but notice that   x^2 - 9  is also a difference of two squares....

 

Can you finish it helperid ???

 

 

cool cool cool

 Nov 3, 2017
 #2
avatar+556 
+1

How didn't I see that on the test...

(x2 + 9)(x + 3)(x - 3), right?

 Nov 3, 2017
 #3
avatar+96189 
0

Correct - A - Mundo.....!!!!

 

 

cool cool cool

 Nov 3, 2017

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