28x^2+29x-12=0

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Solution for 28x^2+29x-12=0 equation:


Simplifying
28x2 + 29x + -12 = 0

Reorder the terms:
-12 + 29x + 28x2 = 0

Solving
-12 + 29x + 28x2 = 0

Solving for variable 'x'.

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

Divide each side by '28'.
-0.4285714286 + 1.035714286x + x2 = 0

Move the constant term to the right:

Add '0.4285714286' to each side of the equation.
-0.4285714286 + 1.035714286x + 0.4285714286 + x2 = 0 + 0.4285714286

Reorder the terms:
-0.4285714286 + 0.4285714286 + 1.035714286x + x2 = 0 + 0.4285714286

Combine like terms: -0.4285714286 + 0.4285714286 = 0.0000000000
0.0000000000 + 1.035714286x + x2 = 0 + 0.4285714286
1.035714286x + x2 = 0 + 0.4285714286

Combine like terms: 0 + 0.4285714286 = 0.4285714286
1.035714286x + x2 = 0.4285714286

The x term is 1.035714286x.  Take half its coefficient (0.517857143).
Square it (0.2681760206) and add it to both sides.

Add '0.2681760206' to each side of the equation.
1.035714286x + 0.2681760206 + x2 = 0.4285714286 + 0.2681760206

Reorder the terms:
0.2681760206 + 1.035714286x + x2 = 0.4285714286 + 0.2681760206

Combine like terms: 0.4285714286 + 0.2681760206 = 0.6967474492
0.2681760206 + 1.035714286x + x2 = 0.6967474492

Factor a perfect square on the left side:
(x + 0.517857143)(x + 0.517857143) = 0.6967474492

Calculate the square root of the right side: 0.834713992

Break this problem into two subproblems by setting 
(x + 0.517857143) equal to 0.834713992 and -0.834713992.

Subproblem 1

x + 0.517857143 = 0.834713992 Simplifying x + 0.517857143 = 0.834713992 Reorder the terms: 0.517857143 + x = 0.834713992 Solving 0.517857143 + x = 0.834713992 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-0.517857143' to each side of the equation. 0.517857143 + -0.517857143 + x = 0.834713992 + -0.517857143 Combine like terms: 0.517857143 + -0.517857143 = 0.000000000 0.000000000 + x = 0.834713992 + -0.517857143 x = 0.834713992 + -0.517857143 Combine like terms: 0.834713992 + -0.517857143 = 0.316856849 x = 0.316856849 Simplifying x = 0.316856849

Subproblem 2

x + 0.517857143 = -0.834713992 Simplifying x + 0.517857143 = -0.834713992 Reorder the terms: 0.517857143 + x = -0.834713992 Solving 0.517857143 + x = -0.834713992 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-0.517857143' to each side of the equation. 0.517857143 + -0.517857143 + x = -0.834713992 + -0.517857143 Combine like terms: 0.517857143 + -0.517857143 = 0.000000000 0.000000000 + x = -0.834713992 + -0.517857143 x = -0.834713992 + -0.517857143 Combine like terms: -0.834713992 + -0.517857143 = -1.352571135 x = -1.352571135 Simplifying x = -1.352571135

Solution

The solution to the problem is based on the solutions from the subproblems. x = {0.316856849, -1.352571135}

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