10x^2+15x-12=0

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Solution for 10x^2+15x-12=0 equation:


Simplifying
10x2 + 15x + -12 = 0

Reorder the terms:
-12 + 15x + 10x2 = 0

Solving
-12 + 15x + 10x2 = 0

Solving for variable 'x'.

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

Divide each side by '10'.
-1.2 + 1.5x + x2 = 0

Move the constant term to the right:

Add '1.2' to each side of the equation.
-1.2 + 1.5x + 1.2 + x2 = 0 + 1.2

Reorder the terms:
-1.2 + 1.2 + 1.5x + x2 = 0 + 1.2

Combine like terms: -1.2 + 1.2 = 0.0
0.0 + 1.5x + x2 = 0 + 1.2
1.5x + x2 = 0 + 1.2

Combine like terms: 0 + 1.2 = 1.2
1.5x + x2 = 1.2

The x term is 1.5x.  Take half its coefficient (0.75).
Square it (0.5625) and add it to both sides.

Add '0.5625' to each side of the equation.
1.5x + 0.5625 + x2 = 1.2 + 0.5625

Reorder the terms:
0.5625 + 1.5x + x2 = 1.2 + 0.5625

Combine like terms: 1.2 + 0.5625 = 1.7625
0.5625 + 1.5x + x2 = 1.7625

Factor a perfect square on the left side:
(x + 0.75)(x + 0.75) = 1.7625

Calculate the square root of the right side: 1.327591805

Break this problem into two subproblems by setting 
(x + 0.75) equal to 1.327591805 and -1.327591805.

Subproblem 1

x + 0.75 = 1.327591805 Simplifying x + 0.75 = 1.327591805 Reorder the terms: 0.75 + x = 1.327591805 Solving 0.75 + x = 1.327591805 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-0.75' to each side of the equation. 0.75 + -0.75 + x = 1.327591805 + -0.75 Combine like terms: 0.75 + -0.75 = 0.00 0.00 + x = 1.327591805 + -0.75 x = 1.327591805 + -0.75 Combine like terms: 1.327591805 + -0.75 = 0.577591805 x = 0.577591805 Simplifying x = 0.577591805

Subproblem 2

x + 0.75 = -1.327591805 Simplifying x + 0.75 = -1.327591805 Reorder the terms: 0.75 + x = -1.327591805 Solving 0.75 + x = -1.327591805 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-0.75' to each side of the equation. 0.75 + -0.75 + x = -1.327591805 + -0.75 Combine like terms: 0.75 + -0.75 = 0.00 0.00 + x = -1.327591805 + -0.75 x = -1.327591805 + -0.75 Combine like terms: -1.327591805 + -0.75 = -2.077591805 x = -2.077591805 Simplifying x = -2.077591805

Solution

The solution to the problem is based on the solutions from the subproblems. x = {0.577591805, -2.077591805}

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