x2 - 16x + 28 = (x - 2)(x - 14). Even though you don't mention any factors below, it is easy to tell that the above-given two factors must be the ones you are looking for. If (14 - x) and (2 - x) are mentioned in your list, they would be good, also.
In the absence of signs I have assumed the term in 16x and 60 are negative: ie x2 - 16x = -60 or x2 - 16x + 60 = 0 Factors of 60 which total -16 are -6 and -10, so (x - 6)(x - 10)
12
X2 - 16X + 15 = 0 (X - 1)(X - 15) = 0 So X -1 = 0 or X - 15 = 0 ie X = 1 or X = 15
The value of x2+7x+10 depends on the value of X. If x=1, then x2+7x+10 = 18 If x=2, then x2+7x+10 = 28 If x=3, then x2+7x+10 = 40 and so forth
That factors to (x - 14)(x - 2)
x2 + 48x + 320
Assuming you wish to make this equation equal zero, for x2 + 16x + 55 = 0, x = -5.
x2+16x-80 = 0 (x-4)(x+20) = 0 x = 4 or x = -20
x2-16x+48 = (x-4)(x-12) when factored
(x - 7)(x - 9)
(x - 5)(x - 11)
x(x + 4)(x - 4) or x3 - 16x
Y=(x+8)^2-5
x2 - 16x + 28 = (x - 2)(x - 14). Even though you don't mention any factors below, it is easy to tell that the above-given two factors must be the ones you are looking for. If (14 - x) and (2 - x) are mentioned in your list, they would be good, also.
Half of the coefficient of x, squared. For example: x2 + 16x -3 you would add 8^2. Then you would have: x2 +16x +8^2 = 3-8^2 Which leads to: (x+8)^2 = -61
(the shape is an upside down 'u').