+633 Factor completely: \(x^4-81\)
I got: \((x^2+9)(x^2-9)\)
What did I miss?
+129899 (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 ???
+633 How didn't I see that on the test...
(x2 + 9)(x + 3)(x - 3), right?
