12x^2+15x-35=0

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Solution for 12x^2+15x-35=0 equation:


Simplifying
12x2 + 15x + -35 = 0

Reorder the terms:
-35 + 15x + 12x2 = 0

Solving
-35 + 15x + 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'.
-2.916666667 + 1.25x + x2 = 0

Move the constant term to the right:

Add '2.916666667' to each side of the equation.
-2.916666667 + 1.25x + 2.916666667 + x2 = 0 + 2.916666667

Reorder the terms:
-2.916666667 + 2.916666667 + 1.25x + x2 = 0 + 2.916666667

Combine like terms: -2.916666667 + 2.916666667 = 0.000000000
0.000000000 + 1.25x + x2 = 0 + 2.916666667
1.25x + x2 = 0 + 2.916666667

Combine like terms: 0 + 2.916666667 = 2.916666667
1.25x + x2 = 2.916666667

The x term is 1.25x.  Take half its coefficient (0.625).
Square it (0.390625) and add it to both sides.

Add '0.390625' to each side of the equation.
1.25x + 0.390625 + x2 = 2.916666667 + 0.390625

Reorder the terms:
0.390625 + 1.25x + x2 = 2.916666667 + 0.390625

Combine like terms: 2.916666667 + 0.390625 = 3.307291667
0.390625 + 1.25x + x2 = 3.307291667

Factor a perfect square on the left side:
(x + 0.625)(x + 0.625) = 3.307291667

Calculate the square root of the right side: 1.81859607

Break this problem into two subproblems by setting 
(x + 0.625) equal to 1.81859607 and -1.81859607.

Subproblem 1

x + 0.625 = 1.81859607 Simplifying x + 0.625 = 1.81859607 Reorder the terms: 0.625 + x = 1.81859607 Solving 0.625 + x = 1.81859607 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-0.625' to each side of the equation. 0.625 + -0.625 + x = 1.81859607 + -0.625 Combine like terms: 0.625 + -0.625 = 0.000 0.000 + x = 1.81859607 + -0.625 x = 1.81859607 + -0.625 Combine like terms: 1.81859607 + -0.625 = 1.19359607 x = 1.19359607 Simplifying x = 1.19359607

Subproblem 2

x + 0.625 = -1.81859607 Simplifying x + 0.625 = -1.81859607 Reorder the terms: 0.625 + x = -1.81859607 Solving 0.625 + x = -1.81859607 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-0.625' to each side of the equation. 0.625 + -0.625 + x = -1.81859607 + -0.625 Combine like terms: 0.625 + -0.625 = 0.000 0.000 + x = -1.81859607 + -0.625 x = -1.81859607 + -0.625 Combine like terms: -1.81859607 + -0.625 = -2.44359607 x = -2.44359607 Simplifying x = -2.44359607

Solution

The solution to the problem is based on the solutions from the subproblems. x = {1.19359607, -2.44359607}

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