10x^2-9x-1368=0

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Solution for 10x^2-9x-1368=0 equation:


Simplifying
10x2 + -9x + -1368 = 0

Reorder the terms:
-1368 + -9x + 10x2 = 0

Solving
-1368 + -9x + 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'.
-136.8 + -0.9x + x2 = 0

Move the constant term to the right:

Add '136.8' to each side of the equation.
-136.8 + -0.9x + 136.8 + x2 = 0 + 136.8

Reorder the terms:
-136.8 + 136.8 + -0.9x + x2 = 0 + 136.8

Combine like terms: -136.8 + 136.8 = 0.0
0.0 + -0.9x + x2 = 0 + 136.8
-0.9x + x2 = 0 + 136.8

Combine like terms: 0 + 136.8 = 136.8
-0.9x + x2 = 136.8

The x term is -0.9x.  Take half its coefficient (-0.45).
Square it (0.2025) and add it to both sides.

Add '0.2025' to each side of the equation.
-0.9x + 0.2025 + x2 = 136.8 + 0.2025

Reorder the terms:
0.2025 + -0.9x + x2 = 136.8 + 0.2025

Combine like terms: 136.8 + 0.2025 = 137.0025
0.2025 + -0.9x + x2 = 137.0025

Factor a perfect square on the left side:
(x + -0.45)(x + -0.45) = 137.0025

Calculate the square root of the right side: 11.704806705

Break this problem into two subproblems by setting 
(x + -0.45) equal to 11.704806705 and -11.704806705.

Subproblem 1

x + -0.45 = 11.704806705 Simplifying x + -0.45 = 11.704806705 Reorder the terms: -0.45 + x = 11.704806705 Solving -0.45 + x = 11.704806705 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '0.45' to each side of the equation. -0.45 + 0.45 + x = 11.704806705 + 0.45 Combine like terms: -0.45 + 0.45 = 0.00 0.00 + x = 11.704806705 + 0.45 x = 11.704806705 + 0.45 Combine like terms: 11.704806705 + 0.45 = 12.154806705 x = 12.154806705 Simplifying x = 12.154806705

Subproblem 2

x + -0.45 = -11.704806705 Simplifying x + -0.45 = -11.704806705 Reorder the terms: -0.45 + x = -11.704806705 Solving -0.45 + x = -11.704806705 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '0.45' to each side of the equation. -0.45 + 0.45 + x = -11.704806705 + 0.45 Combine like terms: -0.45 + 0.45 = 0.00 0.00 + x = -11.704806705 + 0.45 x = -11.704806705 + 0.45 Combine like terms: -11.704806705 + 0.45 = -11.254806705 x = -11.254806705 Simplifying x = -11.254806705

Solution

The solution to the problem is based on the solutions from the subproblems. x = {12.154806705, -11.254806705}

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