Question

x2 + 9x + 18 = 0 complete the square to find roots

Answer 1

x^2 + 2.x. 9/2 + (9/2)^2 - (9/2)^2 + 18 = 0
(x+ 9/2)^2 - 81/4 + 18 = 0
(x + 9/2) ^2 = 9/4

or, (x+9/2) = 3/2 and x + 9/2 = -3/2

x = -3 and x = -6

Answer 2

what does the "2.x." mean?

Answer 3

2 * x

I just wrote 2*a*b as 2 * x * 9/2

Answer 4

okay thanks