12x^2+5x-15=

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Solution for 12x^2+5x-15= equation:


Simplifying
12x2 + 5x + -15 = 0

Reorder the terms:
-15 + 5x + 12x2 = 0

Solving
-15 + 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'.
-1.25 + 0.4166666667x + x2 = 0

Move the constant term to the right:

Add '1.25' to each side of the equation.
-1.25 + 0.4166666667x + 1.25 + x2 = 0 + 1.25

Reorder the terms:
-1.25 + 1.25 + 0.4166666667x + x2 = 0 + 1.25

Combine like terms: -1.25 + 1.25 = 0.00
0.00 + 0.4166666667x + x2 = 0 + 1.25
0.4166666667x + x2 = 0 + 1.25

Combine like terms: 0 + 1.25 = 1.25
0.4166666667x + x2 = 1.25

The x term is 0.4166666667x.  Take half its coefficient (0.2083333334).
Square it (0.04340277781) and add it to both sides.

Add '0.04340277781' to each side of the equation.
0.4166666667x + 0.04340277781 + x2 = 1.25 + 0.04340277781

Reorder the terms:
0.04340277781 + 0.4166666667x + x2 = 1.25 + 0.04340277781

Combine like terms: 1.25 + 0.04340277781 = 1.29340277781
0.04340277781 + 0.4166666667x + x2 = 1.29340277781

Factor a perfect square on the left side:
(x + 0.2083333334)(x + 0.2083333334) = 1.29340277781

Calculate the square root of the right side: 1.137278672

Break this problem into two subproblems by setting 
(x + 0.2083333334) equal to 1.137278672 and -1.137278672.

Subproblem 1

x + 0.2083333334 = 1.137278672 Simplifying x + 0.2083333334 = 1.137278672 Reorder the terms: 0.2083333334 + x = 1.137278672 Solving 0.2083333334 + x = 1.137278672 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-0.2083333334' to each side of the equation. 0.2083333334 + -0.2083333334 + x = 1.137278672 + -0.2083333334 Combine like terms: 0.2083333334 + -0.2083333334 = 0.0000000000 0.0000000000 + x = 1.137278672 + -0.2083333334 x = 1.137278672 + -0.2083333334 Combine like terms: 1.137278672 + -0.2083333334 = 0.9289453386 x = 0.9289453386 Simplifying x = 0.9289453386

Subproblem 2

x + 0.2083333334 = -1.137278672 Simplifying x + 0.2083333334 = -1.137278672 Reorder the terms: 0.2083333334 + x = -1.137278672 Solving 0.2083333334 + x = -1.137278672 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-0.2083333334' to each side of the equation. 0.2083333334 + -0.2083333334 + x = -1.137278672 + -0.2083333334 Combine like terms: 0.2083333334 + -0.2083333334 = 0.0000000000 0.0000000000 + x = -1.137278672 + -0.2083333334 x = -1.137278672 + -0.2083333334 Combine like terms: -1.137278672 + -0.2083333334 = -1.3456120054 x = -1.3456120054 Simplifying x = -1.3456120054

Solution

The solution to the problem is based on the solutions from the subproblems. x = {0.9289453386, -1.3456120054}

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