12x^2+12.5x-5.25=0

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Solution for 12x^2+12.5x-5.25=0 equation:


Simplifying
12x2 + 12.5x + -5.25 = 0

Reorder the terms:
-5.25 + 12.5x + 12x2 = 0

Solving
-5.25 + 12.5x + 12x2 = 0

Solving for variable 'x'.

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

Divide each side by '12'.
-0.4375 + 1.041666667x + x2 = 0

Move the constant term to the right:

Add '0.4375' to each side of the equation.
-0.4375 + 1.041666667x + 0.4375 + x2 = 0 + 0.4375

Reorder the terms:
-0.4375 + 0.4375 + 1.041666667x + x2 = 0 + 0.4375

Combine like terms: -0.4375 + 0.4375 = 0.0000
0.0000 + 1.041666667x + x2 = 0 + 0.4375
1.041666667x + x2 = 0 + 0.4375

Combine like terms: 0 + 0.4375 = 0.4375
1.041666667x + x2 = 0.4375

The x term is 1.041666667x.  Take half its coefficient (0.5208333335).
Square it (0.2712673613) and add it to both sides.

Add '0.2712673613' to each side of the equation.
1.041666667x + 0.2712673613 + x2 = 0.4375 + 0.2712673613

Reorder the terms:
0.2712673613 + 1.041666667x + x2 = 0.4375 + 0.2712673613

Combine like terms: 0.4375 + 0.2712673613 = 0.7087673613
0.2712673613 + 1.041666667x + x2 = 0.7087673613

Factor a perfect square on the left side:
(x + 0.5208333335)(x + 0.5208333335) = 0.7087673613

Calculate the square root of the right side: 0.841883223

Break this problem into two subproblems by setting 
(x + 0.5208333335) equal to 0.841883223 and -0.841883223.

Subproblem 1

x + 0.5208333335 = 0.841883223 Simplifying x + 0.5208333335 = 0.841883223 Reorder the terms: 0.5208333335 + x = 0.841883223 Solving 0.5208333335 + x = 0.841883223 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-0.5208333335' to each side of the equation. 0.5208333335 + -0.5208333335 + x = 0.841883223 + -0.5208333335 Combine like terms: 0.5208333335 + -0.5208333335 = 0.0000000000 0.0000000000 + x = 0.841883223 + -0.5208333335 x = 0.841883223 + -0.5208333335 Combine like terms: 0.841883223 + -0.5208333335 = 0.3210498895 x = 0.3210498895 Simplifying x = 0.3210498895

Subproblem 2

x + 0.5208333335 = -0.841883223 Simplifying x + 0.5208333335 = -0.841883223 Reorder the terms: 0.5208333335 + x = -0.841883223 Solving 0.5208333335 + x = -0.841883223 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-0.5208333335' to each side of the equation. 0.5208333335 + -0.5208333335 + x = -0.841883223 + -0.5208333335 Combine like terms: 0.5208333335 + -0.5208333335 = 0.0000000000 0.0000000000 + x = -0.841883223 + -0.5208333335 x = -0.841883223 + -0.5208333335 Combine like terms: -0.841883223 + -0.5208333335 = -1.3627165565 x = -1.3627165565 Simplifying x = -1.3627165565

Solution

The solution to the problem is based on the solutions from the subproblems. x = {0.3210498895, -1.3627165565}

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