You factor the equation by determining what two numbers, when added, equal 16 and, when multiplied, equal 64. For this equation, the two numbers are 8 and 8. (x+8)*(x+8)=x2+16x+64.
to factor (x2-16x+64), you need to find two number whose product is 64 and whose sum is 16. These two numbers are 8 and 8. (x2-16x+64)=(x-8)(x-8)
x2 + 48x + 320
x2 + 48x + 320
x2 - 16 + 64 = x2 + 48, which does not have real factors.
x3 + 4x2 + 16x + 64 =x2*(x + 4) + 16(x + 4) = (x + 4)*(x2 + 16) which has no further real factors.
(x - 7)(x - 9)
Too bad that's not x^2 - 16x + 64 which factors to (x - 8)(x - 8)
(x - 9)(x - 7)
(x - 14)(x - 2)
It is: x2-16x+60 = (x-6)(x-10) when factored
12
If that's -16x, that factors to (x - 8)(x - 8) or (x - 8)2