Question

solve by completing the square: x^2-10x-18=0

Answer 1

x^2 - 10x + 25 - 25 - 18 = 0
x^2 - 10x + 25 = 43
(x-5)^2 = 43
x-5 = SQRT(43)
x = SQRT(43) + 5

You get two values because SQRT(43) can be positive or negative

Answer 2

-6.56 + 5
+6.56 + 5

Answer 3

GT where you from man?

Answer 4

I simply don't like the representation used by kumar2006 because SQRT(43) is written as is and that in itself will result in a +ve and -ve values.

Answer 5

Funny.....I would have written it as 5 + SQRT(43). When you take the square root of 43, you get positive and negative 6.56.