Question

X^2 + 6x - 18 solve for x​

Answer 1

the answer :X= 8.20

Answer 2

x = - 3 ± √27 or if you want it in decimal form correct to nearest hundredth:

x = -8.20, 2.20.

Explanation:

x^2 + 6x - 18 = 0

this will not factor so we use completing the square:

x^2 + 6x = (x + 3)^2 - 9 so:

(x + 3)^2 - 9 - 18 = 0

(x + 3)^2 = 27

x+ 3 = ±√27

x = - 3 ± √27