10x^2-19x-28=0

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Solution for 10x^2-19x-28=0 equation:


Simplifying
10x2 + -19x + -28 = 0

Reorder the terms:
-28 + -19x + 10x2 = 0

Solving
-28 + -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'.
-2.8 + -1.9x + x2 = 0

Move the constant term to the right:

Add '2.8' to each side of the equation.
-2.8 + -1.9x + 2.8 + x2 = 0 + 2.8

Reorder the terms:
-2.8 + 2.8 + -1.9x + x2 = 0 + 2.8

Combine like terms: -2.8 + 2.8 = 0.0
0.0 + -1.9x + x2 = 0 + 2.8
-1.9x + x2 = 0 + 2.8

Combine like terms: 0 + 2.8 = 2.8
-1.9x + x2 = 2.8

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 = 2.8 + 0.9025

Reorder the terms:
0.9025 + -1.9x + x2 = 2.8 + 0.9025

Combine like terms: 2.8 + 0.9025 = 3.7025
0.9025 + -1.9x + x2 = 3.7025

Factor a perfect square on the left side:
(x + -0.95)(x + -0.95) = 3.7025

Calculate the square root of the right side: 1.92418814

Break this problem into two subproblems by setting 
(x + -0.95) equal to 1.92418814 and -1.92418814.

Subproblem 1

x + -0.95 = 1.92418814 Simplifying x + -0.95 = 1.92418814 Reorder the terms: -0.95 + x = 1.92418814 Solving -0.95 + x = 1.92418814 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 = 1.92418814 + 0.95 Combine like terms: -0.95 + 0.95 = 0.00 0.00 + x = 1.92418814 + 0.95 x = 1.92418814 + 0.95 Combine like terms: 1.92418814 + 0.95 = 2.87418814 x = 2.87418814 Simplifying x = 2.87418814

Subproblem 2

x + -0.95 = -1.92418814 Simplifying x + -0.95 = -1.92418814 Reorder the terms: -0.95 + x = -1.92418814 Solving -0.95 + x = -1.92418814 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 = -1.92418814 + 0.95 Combine like terms: -0.95 + 0.95 = 0.00 0.00 + x = -1.92418814 + 0.95 x = -1.92418814 + 0.95 Combine like terms: -1.92418814 + 0.95 = -0.97418814 x = -0.97418814 Simplifying x = -0.97418814

Solution

The solution to the problem is based on the solutions from the subproblems. x = {2.87418814, -0.97418814}

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