In order to complete the square for the equation below, what value should be added to both sides of the equation? x2 - 8x + ? = 42 + ?

? = 16

Step-by-step explanation:

x2 - 8x + ? = 42 + ?

1. Take the coefficient of the middle term 8x, which is 8 and divide it by 2.  . Then square it  

2. Take 16 and add it to both sides:

2. Take half of the coefficient 8 that you divided by 2, which is 4 and insert 4 into the equation

3. ? = 16

answer: a

step-by-step explanation:

10.2 units

you can't solve x because it is 2 linear equation and you only have one equation