(x+6)(x+18)=168

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Solution for (x+6)(x+18)=168 equation:


Simplifying
(x + 6)(x + 18) = 168

Reorder the terms:
(6 + x)(x + 18) = 168

Reorder the terms:
(6 + x)(18 + x) = 168

Multiply (6 + x) * (18 + x)
(6(18 + x) + x(18 + x)) = 168
((18 * 6 + x * 6) + x(18 + x)) = 168
((108 + 6x) + x(18 + x)) = 168
(108 + 6x + (18 * x + x * x)) = 168
(108 + 6x + (18x + x2)) = 168

Combine like terms: 6x + 18x = 24x
(108 + 24x + x2) = 168

Solving
108 + 24x + x2 = 168

Solving for variable 'x'.

Reorder the terms:
108 + -168 + 24x + x2 = 168 + -168

Combine like terms: 108 + -168 = -60
-60 + 24x + x2 = 168 + -168

Combine like terms: 168 + -168 = 0
-60 + 24x + x2 = 0

Begin completing the square.

Move the constant term to the right:

Add '60' to each side of the equation.
-60 + 24x + 60 + x2 = 0 + 60

Reorder the terms:
-60 + 60 + 24x + x2 = 0 + 60

Combine like terms: -60 + 60 = 0
0 + 24x + x2 = 0 + 60
24x + x2 = 0 + 60

Combine like terms: 0 + 60 = 60
24x + x2 = 60

The x term is 24x.  Take half its coefficient (12).
Square it (144) and add it to both sides.

Add '144' to each side of the equation.
24x + 144 + x2 = 60 + 144

Reorder the terms:
144 + 24x + x2 = 60 + 144

Combine like terms: 60 + 144 = 204
144 + 24x + x2 = 204

Factor a perfect square on the left side:
(x + 12)(x + 12) = 204

Calculate the square root of the right side: 14.282856857

Break this problem into two subproblems by setting 
(x + 12) equal to 14.282856857 and -14.282856857.

Subproblem 1

x + 12 = 14.282856857 Simplifying x + 12 = 14.282856857 Reorder the terms: 12 + x = 14.282856857 Solving 12 + x = 14.282856857 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-12' to each side of the equation. 12 + -12 + x = 14.282856857 + -12 Combine like terms: 12 + -12 = 0 0 + x = 14.282856857 + -12 x = 14.282856857 + -12 Combine like terms: 14.282856857 + -12 = 2.282856857 x = 2.282856857 Simplifying x = 2.282856857

Subproblem 2

x + 12 = -14.282856857 Simplifying x + 12 = -14.282856857 Reorder the terms: 12 + x = -14.282856857 Solving 12 + x = -14.282856857 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-12' to each side of the equation. 12 + -12 + x = -14.282856857 + -12 Combine like terms: 12 + -12 = 0 0 + x = -14.282856857 + -12 x = -14.282856857 + -12 Combine like terms: -14.282856857 + -12 = -26.282856857 x = -26.282856857 Simplifying x = -26.282856857

Solution

The solution to the problem is based on the solutions from the subproblems. x = {2.282856857, -26.282856857}

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