Question

HELPPPPPPPPPPPPPPPPPPPPPPPP

Answer 1

`16`

Explanation:

`{x}^(2) - 8x + c`

`{x}^(2) + c - 8x`

To find the c value
`c = ( (b)/(2))^(2)` , divide the coefficient of x by 2 and square the result.

`( - 1 * 4 {)}^(2)`

`( - 4 {)}^(2)`

`16`

Hope it is helpful....