14x^2-5x-8=0

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Solution for 14x^2-5x-8=0 equation:


Simplifying
14x2 + -5x + -8 = 0

Reorder the terms:
-8 + -5x + 14x2 = 0

Solving
-8 + -5x + 14x2 = 0

Solving for variable 'x'.

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

Divide each side by '14'.
-0.5714285714 + -0.3571428571x + x2 = 0

Move the constant term to the right:

Add '0.5714285714' to each side of the equation.
-0.5714285714 + -0.3571428571x + 0.5714285714 + x2 = 0 + 0.5714285714

Reorder the terms:
-0.5714285714 + 0.5714285714 + -0.3571428571x + x2 = 0 + 0.5714285714

Combine like terms: -0.5714285714 + 0.5714285714 = 0.0000000000
0.0000000000 + -0.3571428571x + x2 = 0 + 0.5714285714
-0.3571428571x + x2 = 0 + 0.5714285714

Combine like terms: 0 + 0.5714285714 = 0.5714285714
-0.3571428571x + x2 = 0.5714285714

The x term is -0.3571428571x.  Take half its coefficient (-0.1785714286).
Square it (0.03188775511) and add it to both sides.

Add '0.03188775511' to each side of the equation.
-0.3571428571x + 0.03188775511 + x2 = 0.5714285714 + 0.03188775511

Reorder the terms:
0.03188775511 + -0.3571428571x + x2 = 0.5714285714 + 0.03188775511

Combine like terms: 0.5714285714 + 0.03188775511 = 0.60331632651
0.03188775511 + -0.3571428571x + x2 = 0.60331632651

Factor a perfect square on the left side:
(x + -0.1785714286)(x + -0.1785714286) = 0.60331632651

Calculate the square root of the right side: 0.776734399

Break this problem into two subproblems by setting 
(x + -0.1785714286) equal to 0.776734399 and -0.776734399.

Subproblem 1

x + -0.1785714286 = 0.776734399 Simplifying x + -0.1785714286 = 0.776734399 Reorder the terms: -0.1785714286 + x = 0.776734399 Solving -0.1785714286 + x = 0.776734399 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '0.1785714286' to each side of the equation. -0.1785714286 + 0.1785714286 + x = 0.776734399 + 0.1785714286 Combine like terms: -0.1785714286 + 0.1785714286 = 0.0000000000 0.0000000000 + x = 0.776734399 + 0.1785714286 x = 0.776734399 + 0.1785714286 Combine like terms: 0.776734399 + 0.1785714286 = 0.9553058276 x = 0.9553058276 Simplifying x = 0.9553058276

Subproblem 2

x + -0.1785714286 = -0.776734399 Simplifying x + -0.1785714286 = -0.776734399 Reorder the terms: -0.1785714286 + x = -0.776734399 Solving -0.1785714286 + x = -0.776734399 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '0.1785714286' to each side of the equation. -0.1785714286 + 0.1785714286 + x = -0.776734399 + 0.1785714286 Combine like terms: -0.1785714286 + 0.1785714286 = 0.0000000000 0.0000000000 + x = -0.776734399 + 0.1785714286 x = -0.776734399 + 0.1785714286 Combine like terms: -0.776734399 + 0.1785714286 = -0.5981629704 x = -0.5981629704 Simplifying x = -0.5981629704

Solution

The solution to the problem is based on the solutions from the subproblems. x = {0.9553058276, -0.5981629704}

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