10x^2+19x-9=0

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Solution for 10x^2+19x-9=0 equation:


Simplifying
10x2 + 19x + -9 = 0

Reorder the terms:
-9 + 19x + 10x2 = 0

Solving
-9 + 19x + 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'.
-0.9 + 1.9x + x2 = 0

Move the constant term to the right:

Add '0.9' to each side of the equation.
-0.9 + 1.9x + 0.9 + x2 = 0 + 0.9

Reorder the terms:
-0.9 + 0.9 + 1.9x + x2 = 0 + 0.9

Combine like terms: -0.9 + 0.9 = 0.0
0.0 + 1.9x + x2 = 0 + 0.9
1.9x + x2 = 0 + 0.9

Combine like terms: 0 + 0.9 = 0.9
1.9x + x2 = 0.9

The x term is 1.9x.  Take half its coefficient (0.95).
Square it (0.9025) and add it to both sides.

Add '0.9025' to each side of the equation.
1.9x + 0.9025 + x2 = 0.9 + 0.9025

Reorder the terms:
0.9025 + 1.9x + x2 = 0.9 + 0.9025

Combine like terms: 0.9 + 0.9025 = 1.8025
0.9025 + 1.9x + x2 = 1.8025

Factor a perfect square on the left side:
(x + 0.95)(x + 0.95) = 1.8025

Calculate the square root of the right side: 1.342572158

Break this problem into two subproblems by setting 
(x + 0.95) equal to 1.342572158 and -1.342572158.

Subproblem 1

x + 0.95 = 1.342572158 Simplifying x + 0.95 = 1.342572158 Reorder the terms: 0.95 + x = 1.342572158 Solving 0.95 + x = 1.342572158 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-0.95' to each side of the equation. 0.95 + -0.95 + x = 1.342572158 + -0.95 Combine like terms: 0.95 + -0.95 = 0.00 0.00 + x = 1.342572158 + -0.95 x = 1.342572158 + -0.95 Combine like terms: 1.342572158 + -0.95 = 0.392572158 x = 0.392572158 Simplifying x = 0.392572158

Subproblem 2

x + 0.95 = -1.342572158 Simplifying x + 0.95 = -1.342572158 Reorder the terms: 0.95 + x = -1.342572158 Solving 0.95 + x = -1.342572158 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-0.95' to each side of the equation. 0.95 + -0.95 + x = -1.342572158 + -0.95 Combine like terms: 0.95 + -0.95 = 0.00 0.00 + x = -1.342572158 + -0.95 x = -1.342572158 + -0.95 Combine like terms: -1.342572158 + -0.95 = -2.292572158 x = -2.292572158 Simplifying x = -2.292572158

Solution

The solution to the problem is based on the solutions from the subproblems. x = {0.392572158, -2.292572158}

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