Hi Brainiac
0 = 4(x -2)(4x+1)
0 = (4(x-2))(4x+1)
0 = (4(x-2))(4)+(4(x-2)(1)
0 = 16x² - 32x + 4x - 8
0 = 16x² - 28x - 8
Flip them( Remember when you flip them make sure you always change their signs.
-16x² + 28x + 8 = 0
Now we need to factor them
-4(4x +1)(x-2) = 0
Set factors equal to 0
4x +1 = 0 or x - 2 = 0
4x = 0 - 1 or x = 0 + 2
4x = -1 or x = 2
x = -1/4 or x = 2
I hope that's help !
Let me know if you have further question about my answer.