4x^2-12x=13

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Solution for 4x^2-12x=13 equation:


Simplifying
4x2 + -12x = 13

Reorder the terms:
-12x + 4x2 = 13

Solving
-12x + 4x2 = 13

Solving for variable 'x'.

Reorder the terms:
-13 + -12x + 4x2 = 13 + -13

Combine like terms: 13 + -13 = 0
-13 + -12x + 4x2 = 0

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

Divide each side by '4'.
-3.25 + -3x + x2 = 0

Move the constant term to the right:

Add '3.25' to each side of the equation.
-3.25 + -3x + 3.25 + x2 = 0 + 3.25

Reorder the terms:
-3.25 + 3.25 + -3x + x2 = 0 + 3.25

Combine like terms: -3.25 + 3.25 = 0.00
0.00 + -3x + x2 = 0 + 3.25
-3x + x2 = 0 + 3.25

Combine like terms: 0 + 3.25 = 3.25
-3x + x2 = 3.25

The x term is -3x.  Take half its coefficient (-1.5).
Square it (2.25) and add it to both sides.

Add '2.25' to each side of the equation.
-3x + 2.25 + x2 = 3.25 + 2.25

Reorder the terms:
2.25 + -3x + x2 = 3.25 + 2.25

Combine like terms: 3.25 + 2.25 = 5.5
2.25 + -3x + x2 = 5.5

Factor a perfect square on the left side:
(x + -1.5)(x + -1.5) = 5.5

Calculate the square root of the right side: 2.34520788

Break this problem into two subproblems by setting 
(x + -1.5) equal to 2.34520788 and -2.34520788.

Subproblem 1

x + -1.5 = 2.34520788 Simplifying x + -1.5 = 2.34520788 Reorder the terms: -1.5 + x = 2.34520788 Solving -1.5 + x = 2.34520788 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '1.5' to each side of the equation. -1.5 + 1.5 + x = 2.34520788 + 1.5 Combine like terms: -1.5 + 1.5 = 0.0 0.0 + x = 2.34520788 + 1.5 x = 2.34520788 + 1.5 Combine like terms: 2.34520788 + 1.5 = 3.84520788 x = 3.84520788 Simplifying x = 3.84520788

Subproblem 2

x + -1.5 = -2.34520788 Simplifying x + -1.5 = -2.34520788 Reorder the terms: -1.5 + x = -2.34520788 Solving -1.5 + x = -2.34520788 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '1.5' to each side of the equation. -1.5 + 1.5 + x = -2.34520788 + 1.5 Combine like terms: -1.5 + 1.5 = 0.0 0.0 + x = -2.34520788 + 1.5 x = -2.34520788 + 1.5 Combine like terms: -2.34520788 + 1.5 = -0.84520788 x = -0.84520788 Simplifying x = -0.84520788

Solution

The solution to the problem is based on the solutions from the subproblems. x = {3.84520788, -0.84520788}

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