Question

When solving x2 – 16x = 10 by completing the square what value is added to both sides of the equation?

Answer 1

(x-8) squared

Answer 2

ok well, to figure out how to complete the square here, you divide the middle term by 2x., which gives you -8.
this

Answer 3

You add 64 to both sides.

Answer 4

That's what gets you (x-8)^2 = 74. But the question is asking for the value added to both sides.