(x-12)(x+4)=9

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Solution for (x-12)(x+4)=9 equation:


Simplifying
(x + -12)(x + 4) = 9

Reorder the terms:
(-12 + x)(x + 4) = 9

Reorder the terms:
(-12 + x)(4 + x) = 9

Multiply (-12 + x) * (4 + x)
(-12(4 + x) + x(4 + x)) = 9
((4 * -12 + x * -12) + x(4 + x)) = 9
((-48 + -12x) + x(4 + x)) = 9
(-48 + -12x + (4 * x + x * x)) = 9
(-48 + -12x + (4x + x2)) = 9

Combine like terms: -12x + 4x = -8x
(-48 + -8x + x2) = 9

Solving
-48 + -8x + x2 = 9

Solving for variable 'x'.

Reorder the terms:
-48 + -9 + -8x + x2 = 9 + -9

Combine like terms: -48 + -9 = -57
-57 + -8x + x2 = 9 + -9

Combine like terms: 9 + -9 = 0
-57 + -8x + x2 = 0

Begin completing the square.

Move the constant term to the right:

Add '57' to each side of the equation.
-57 + -8x + 57 + x2 = 0 + 57

Reorder the terms:
-57 + 57 + -8x + x2 = 0 + 57

Combine like terms: -57 + 57 = 0
0 + -8x + x2 = 0 + 57
-8x + x2 = 0 + 57

Combine like terms: 0 + 57 = 57
-8x + x2 = 57

The x term is -8x.  Take half its coefficient (-4).
Square it (16) and add it to both sides.

Add '16' to each side of the equation.
-8x + 16 + x2 = 57 + 16

Reorder the terms:
16 + -8x + x2 = 57 + 16

Combine like terms: 57 + 16 = 73
16 + -8x + x2 = 73

Factor a perfect square on the left side:
(x + -4)(x + -4) = 73

Calculate the square root of the right side: 8.544003745

Break this problem into two subproblems by setting 
(x + -4) equal to 8.544003745 and -8.544003745.

Subproblem 1

x + -4 = 8.544003745 Simplifying x + -4 = 8.544003745 Reorder the terms: -4 + x = 8.544003745 Solving -4 + x = 8.544003745 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '4' to each side of the equation. -4 + 4 + x = 8.544003745 + 4 Combine like terms: -4 + 4 = 0 0 + x = 8.544003745 + 4 x = 8.544003745 + 4 Combine like terms: 8.544003745 + 4 = 12.544003745 x = 12.544003745 Simplifying x = 12.544003745

Subproblem 2

x + -4 = -8.544003745 Simplifying x + -4 = -8.544003745 Reorder the terms: -4 + x = -8.544003745 Solving -4 + x = -8.544003745 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '4' to each side of the equation. -4 + 4 + x = -8.544003745 + 4 Combine like terms: -4 + 4 = 0 0 + x = -8.544003745 + 4 x = -8.544003745 + 4 Combine like terms: -8.544003745 + 4 = -4.544003745 x = -4.544003745 Simplifying x = -4.544003745

Solution

The solution to the problem is based on the solutions from the subproblems. x = {12.544003745, -4.544003745}

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