solve the equation by completing the square: x^2-3x-18=0. after completing the square, the equation will be and the solution is

x = - 3, x = 6

Step-by-step explanation:

x² - 3x - 18 = 0 ( add 18 to both sides )

x² - 3x = 18

To complete the square

add ( half the coefficient of the x- term )² to both sides

x² + 2(- )x + = 18 +

(x - )² = ( take square root of both sides )

x - = ± = ± ( add to both sides )

x = ±

Then

x = - = = - 3

x = + = 6

5

step-by-step explanation:

b

step-by-step explanation: