-16x(x-2)
To factor anything, let's see what they both have or they can divide by.
Oh in this equation, we see they both have x and they can divide by -16. so factor out -16x. -16x(?+?) , then take the numbers and symbol divide for the factor. -16x^2/-16x = x and 32x/-16x = -2
So we got -16x(x-2)