-12x^2=3x-28

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Solution for -12x^2=3x-28 equation:


Simplifying
-12x2 = 3x + -28

Reorder the terms:
-12x2 = -28 + 3x

Solving
-12x2 = -28 + 3x

Solving for variable 'x'.

Reorder the terms:
28 + -3x + -12x2 = -28 + 3x + 28 + -3x

Reorder the terms:
28 + -3x + -12x2 = -28 + 28 + 3x + -3x

Combine like terms: -28 + 28 = 0
28 + -3x + -12x2 = 0 + 3x + -3x
28 + -3x + -12x2 = 3x + -3x

Combine like terms: 3x + -3x = 0
28 + -3x + -12x2 = 0

Begin completing the square.  Divide all terms by
-12 the coefficient of the squared term: 

Divide each side by '-12'.
-2.333333333 + 0.25x + x2 = 0

Move the constant term to the right:

Add '2.333333333' to each side of the equation.
-2.333333333 + 0.25x + 2.333333333 + x2 = 0 + 2.333333333

Reorder the terms:
-2.333333333 + 2.333333333 + 0.25x + x2 = 0 + 2.333333333

Combine like terms: -2.333333333 + 2.333333333 = 0.000000000
0.000000000 + 0.25x + x2 = 0 + 2.333333333
0.25x + x2 = 0 + 2.333333333

Combine like terms: 0 + 2.333333333 = 2.333333333
0.25x + x2 = 2.333333333

The x term is 0.25x.  Take half its coefficient (0.125).
Square it (0.015625) and add it to both sides.

Add '0.015625' to each side of the equation.
0.25x + 0.015625 + x2 = 2.333333333 + 0.015625

Reorder the terms:
0.015625 + 0.25x + x2 = 2.333333333 + 0.015625

Combine like terms: 2.333333333 + 0.015625 = 2.348958333
0.015625 + 0.25x + x2 = 2.348958333

Factor a perfect square on the left side:
(x + 0.125)(x + 0.125) = 2.348958333

Calculate the square root of the right side: 1.53263118

Break this problem into two subproblems by setting 
(x + 0.125) equal to 1.53263118 and -1.53263118.

Subproblem 1

x + 0.125 = 1.53263118 Simplifying x + 0.125 = 1.53263118 Reorder the terms: 0.125 + x = 1.53263118 Solving 0.125 + x = 1.53263118 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-0.125' to each side of the equation. 0.125 + -0.125 + x = 1.53263118 + -0.125 Combine like terms: 0.125 + -0.125 = 0.000 0.000 + x = 1.53263118 + -0.125 x = 1.53263118 + -0.125 Combine like terms: 1.53263118 + -0.125 = 1.40763118 x = 1.40763118 Simplifying x = 1.40763118

Subproblem 2

x + 0.125 = -1.53263118 Simplifying x + 0.125 = -1.53263118 Reorder the terms: 0.125 + x = -1.53263118 Solving 0.125 + x = -1.53263118 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-0.125' to each side of the equation. 0.125 + -0.125 + x = -1.53263118 + -0.125 Combine like terms: 0.125 + -0.125 = 0.000 0.000 + x = -1.53263118 + -0.125 x = -1.53263118 + -0.125 Combine like terms: -1.53263118 + -0.125 = -1.65763118 x = -1.65763118 Simplifying x = -1.65763118

Solution

The solution to the problem is based on the solutions from the subproblems. x = {1.40763118, -1.65763118}

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