Question

Jenny Is solving the equation x^2-8x=9 by completing the square. What number should be added to both sides of the equation to complete the square?

Answer 1

$$(\frac b 2)^2$$

Answer 2

oh ok thanks

Answer 3

b=8
1/2b=4
(1/2b)^2=16

Answer 4

ok, thank-you

Answer 5

I though that we had to plug in a number for one of the variables

Answer 6

but, I get it now, thank-you