10x^2-12x-19=0

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Solution for 10x^2-12x-19=0 equation:


Simplifying
10x2 + -12x + -19 = 0

Reorder the terms:
-19 + -12x + 10x2 = 0

Solving
-19 + -12x + 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'.
-1.9 + -1.2x + x2 = 0

Move the constant term to the right:

Add '1.9' to each side of the equation.
-1.9 + -1.2x + 1.9 + x2 = 0 + 1.9

Reorder the terms:
-1.9 + 1.9 + -1.2x + x2 = 0 + 1.9

Combine like terms: -1.9 + 1.9 = 0.0
0.0 + -1.2x + x2 = 0 + 1.9
-1.2x + x2 = 0 + 1.9

Combine like terms: 0 + 1.9 = 1.9
-1.2x + x2 = 1.9

The x term is -1.2x.  Take half its coefficient (-0.6).
Square it (0.36) and add it to both sides.

Add '0.36' to each side of the equation.
-1.2x + 0.36 + x2 = 1.9 + 0.36

Reorder the terms:
0.36 + -1.2x + x2 = 1.9 + 0.36

Combine like terms: 1.9 + 0.36 = 2.26
0.36 + -1.2x + x2 = 2.26

Factor a perfect square on the left side:
(x + -0.6)(x + -0.6) = 2.26

Calculate the square root of the right side: 1.503329638

Break this problem into two subproblems by setting 
(x + -0.6) equal to 1.503329638 and -1.503329638.

Subproblem 1

x + -0.6 = 1.503329638 Simplifying x + -0.6 = 1.503329638 Reorder the terms: -0.6 + x = 1.503329638 Solving -0.6 + x = 1.503329638 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '0.6' to each side of the equation. -0.6 + 0.6 + x = 1.503329638 + 0.6 Combine like terms: -0.6 + 0.6 = 0.0 0.0 + x = 1.503329638 + 0.6 x = 1.503329638 + 0.6 Combine like terms: 1.503329638 + 0.6 = 2.103329638 x = 2.103329638 Simplifying x = 2.103329638

Subproblem 2

x + -0.6 = -1.503329638 Simplifying x + -0.6 = -1.503329638 Reorder the terms: -0.6 + x = -1.503329638 Solving -0.6 + x = -1.503329638 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '0.6' to each side of the equation. -0.6 + 0.6 + x = -1.503329638 + 0.6 Combine like terms: -0.6 + 0.6 = 0.0 0.0 + x = -1.503329638 + 0.6 x = -1.503329638 + 0.6 Combine like terms: -1.503329638 + 0.6 = -0.903329638 x = -0.903329638 Simplifying x = -0.903329638

Solution

The solution to the problem is based on the solutions from the subproblems. x = {2.103329638, -0.903329638}

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