28x^2-1x-12=0

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Solution for 28x^2-1x-12=0 equation:


Simplifying
28x2 + -1x + -12 = 0

Reorder the terms:
-12 + -1x + 28x2 = 0

Solving
-12 + -1x + 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 + -0.03571428571x + x2 = 0

Move the constant term to the right:

Add '0.4285714286' to each side of the equation.
-0.4285714286 + -0.03571428571x + 0.4285714286 + x2 = 0 + 0.4285714286

Reorder the terms:
-0.4285714286 + 0.4285714286 + -0.03571428571x + x2 = 0 + 0.4285714286

Combine like terms: -0.4285714286 + 0.4285714286 = 0.0000000000
0.0000000000 + -0.03571428571x + x2 = 0 + 0.4285714286
-0.03571428571x + x2 = 0 + 0.4285714286

Combine like terms: 0 + 0.4285714286 = 0.4285714286
-0.03571428571x + x2 = 0.4285714286

The x term is -0.03571428571x.  Take half its coefficient (-0.01785714286).
Square it (0.0003188775511) and add it to both sides.

Add '0.0003188775511' to each side of the equation.
-0.03571428571x + 0.0003188775511 + x2 = 0.4285714286 + 0.0003188775511

Reorder the terms:
0.0003188775511 + -0.03571428571x + x2 = 0.4285714286 + 0.0003188775511

Combine like terms: 0.4285714286 + 0.0003188775511 = 0.4288903061511
0.0003188775511 + -0.03571428571x + x2 = 0.4288903061511

Factor a perfect square on the left side:
(x + -0.01785714286)(x + -0.01785714286) = 0.4288903061511

Calculate the square root of the right side: 0.654897172

Break this problem into two subproblems by setting 
(x + -0.01785714286) equal to 0.654897172 and -0.654897172.

Subproblem 1

x + -0.01785714286 = 0.654897172 Simplifying x + -0.01785714286 = 0.654897172 Reorder the terms: -0.01785714286 + x = 0.654897172 Solving -0.01785714286 + x = 0.654897172 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '0.01785714286' to each side of the equation. -0.01785714286 + 0.01785714286 + x = 0.654897172 + 0.01785714286 Combine like terms: -0.01785714286 + 0.01785714286 = 0.00000000000 0.00000000000 + x = 0.654897172 + 0.01785714286 x = 0.654897172 + 0.01785714286 Combine like terms: 0.654897172 + 0.01785714286 = 0.67275431486 x = 0.67275431486 Simplifying x = 0.67275431486

Subproblem 2

x + -0.01785714286 = -0.654897172 Simplifying x + -0.01785714286 = -0.654897172 Reorder the terms: -0.01785714286 + x = -0.654897172 Solving -0.01785714286 + x = -0.654897172 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '0.01785714286' to each side of the equation. -0.01785714286 + 0.01785714286 + x = -0.654897172 + 0.01785714286 Combine like terms: -0.01785714286 + 0.01785714286 = 0.00000000000 0.00000000000 + x = -0.654897172 + 0.01785714286 x = -0.654897172 + 0.01785714286 Combine like terms: -0.654897172 + 0.01785714286 = -0.63704002914 x = -0.63704002914 Simplifying x = -0.63704002914

Solution

The solution to the problem is based on the solutions from the subproblems. x = {0.67275431486, -0.63704002914}

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