Hey Kaitlyn!
x^6 - 16x² = 4x^4 - 64
Again, I'm gonna use the same steps I am familiar with.
x^6 - 16x² - 4x4 + 64 = 0
Just factorize them - BE CAREFUL THOUGH!
(x +2)(x +2)(x -2)(x -2)(x² + 4) = 0
Now we can just set them equal to 0
x + 2 = 0 or x + 2 = 0 or x - 2 = 0 or x - 2= 0 or x² + 4 = 0
x = -2 or x = -2 or x = 2 or x = 2
The correct option is : B (-2,2)
A+ Guaranteed!