4x^2+12x-39=0

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Solution for 4x^2+12x-39=0 equation:


Simplifying
4x2 + 12x + -39 = 0

Reorder the terms:
-39 + 12x + 4x2 = 0

Solving
-39 + 12x + 4x2 = 0

Solving for variable 'x'.

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

Divide each side by '4'.
-9.75 + 3x + x2 = 0

Move the constant term to the right:

Add '9.75' to each side of the equation.
-9.75 + 3x + 9.75 + x2 = 0 + 9.75

Reorder the terms:
-9.75 + 9.75 + 3x + x2 = 0 + 9.75

Combine like terms: -9.75 + 9.75 = 0.00
0.00 + 3x + x2 = 0 + 9.75
3x + x2 = 0 + 9.75

Combine like terms: 0 + 9.75 = 9.75
3x + x2 = 9.75

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 = 9.75 + 2.25

Reorder the terms:
2.25 + 3x + x2 = 9.75 + 2.25

Combine like terms: 9.75 + 2.25 = 12
2.25 + 3x + x2 = 12

Factor a perfect square on the left side:
(x + 1.5)(x + 1.5) = 12

Calculate the square root of the right side: 3.464101615

Break this problem into two subproblems by setting 
(x + 1.5) equal to 3.464101615 and -3.464101615.

Subproblem 1

x + 1.5 = 3.464101615 Simplifying x + 1.5 = 3.464101615 Reorder the terms: 1.5 + x = 3.464101615 Solving 1.5 + x = 3.464101615 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 = 3.464101615 + -1.5 Combine like terms: 1.5 + -1.5 = 0.0 0.0 + x = 3.464101615 + -1.5 x = 3.464101615 + -1.5 Combine like terms: 3.464101615 + -1.5 = 1.964101615 x = 1.964101615 Simplifying x = 1.964101615

Subproblem 2

x + 1.5 = -3.464101615 Simplifying x + 1.5 = -3.464101615 Reorder the terms: 1.5 + x = -3.464101615 Solving 1.5 + x = -3.464101615 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 = -3.464101615 + -1.5 Combine like terms: 1.5 + -1.5 = 0.0 0.0 + x = -3.464101615 + -1.5 x = -3.464101615 + -1.5 Combine like terms: -3.464101615 + -1.5 = -4.964101615 x = -4.964101615 Simplifying x = -4.964101615

Solution

The solution to the problem is based on the solutions from the subproblems. x = {1.964101615, -4.964101615}

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