4x(x-12)=55

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Solution for 4x(x-12)=55 equation:


Simplifying
4x(x + -12) = 55

Reorder the terms:
4x(-12 + x) = 55
(-12 * 4x + x * 4x) = 55
(-48x + 4x2) = 55

Solving
-48x + 4x2 = 55

Solving for variable 'x'.

Reorder the terms:
-55 + -48x + 4x2 = 55 + -55

Combine like terms: 55 + -55 = 0
-55 + -48x + 4x2 = 0

Begin completing the square.  Divide all terms by
4 the coefficient of the squared term: 

Divide each side by '4'.
-13.75 + -12x + x2 = 0

Move the constant term to the right:

Add '13.75' to each side of the equation.
-13.75 + -12x + 13.75 + x2 = 0 + 13.75

Reorder the terms:
-13.75 + 13.75 + -12x + x2 = 0 + 13.75

Combine like terms: -13.75 + 13.75 = 0.00
0.00 + -12x + x2 = 0 + 13.75
-12x + x2 = 0 + 13.75

Combine like terms: 0 + 13.75 = 13.75
-12x + x2 = 13.75

The x term is -12x.  Take half its coefficient (-6).
Square it (36) and add it to both sides.

Add '36' to each side of the equation.
-12x + 36 + x2 = 13.75 + 36

Reorder the terms:
36 + -12x + x2 = 13.75 + 36

Combine like terms: 13.75 + 36 = 49.75
36 + -12x + x2 = 49.75

Factor a perfect square on the left side:
(x + -6)(x + -6) = 49.75

Calculate the square root of the right side: 7.05336799

Break this problem into two subproblems by setting 
(x + -6) equal to 7.05336799 and -7.05336799.

Subproblem 1

x + -6 = 7.05336799 Simplifying x + -6 = 7.05336799 Reorder the terms: -6 + x = 7.05336799 Solving -6 + x = 7.05336799 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '6' to each side of the equation. -6 + 6 + x = 7.05336799 + 6 Combine like terms: -6 + 6 = 0 0 + x = 7.05336799 + 6 x = 7.05336799 + 6 Combine like terms: 7.05336799 + 6 = 13.05336799 x = 13.05336799 Simplifying x = 13.05336799

Subproblem 2

x + -6 = -7.05336799 Simplifying x + -6 = -7.05336799 Reorder the terms: -6 + x = -7.05336799 Solving -6 + x = -7.05336799 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '6' to each side of the equation. -6 + 6 + x = -7.05336799 + 6 Combine like terms: -6 + 6 = 0 0 + x = -7.05336799 + 6 x = -7.05336799 + 6 Combine like terms: -7.05336799 + 6 = -1.05336799 x = -1.05336799 Simplifying x = -1.05336799

Solution

The solution to the problem is based on the solutions from the subproblems. x = {13.05336799, -1.05336799}

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