Solve x2 + 12x = –11 by completing the square. which is the solution set of the equation? {–11, –1} {–11, 1} {11, –1} {11, 1} , hurry : ( you!

Original Equation:

x^2 + 12x = -11

Make it a proper quadratic equation by moving the -11 to the left:

x^2 + 12x + 11 = 0

Find out what 2 numbers multiplied will give us 11 and add up to 12 and break the problem up:

(x + 1)(x + 11) = 0

Now solve for x in both cases:

x+1 = 0
x = -1

x + 11 = 0
x = -11

Your final set is: {-11, -1}

Ican't do any of the other stuff, but i can get you started. the answer, i believe, is $2.50.