10x^2-3x-86=0

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Solution for 10x^2-3x-86=0 equation:


Simplifying
10x2 + -3x + -86 = 0

Reorder the terms:
-86 + -3x + 10x2 = 0

Solving
-86 + -3x + 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'.
-8.6 + -0.3x + x2 = 0

Move the constant term to the right:

Add '8.6' to each side of the equation.
-8.6 + -0.3x + 8.6 + x2 = 0 + 8.6

Reorder the terms:
-8.6 + 8.6 + -0.3x + x2 = 0 + 8.6

Combine like terms: -8.6 + 8.6 = 0.0
0.0 + -0.3x + x2 = 0 + 8.6
-0.3x + x2 = 0 + 8.6

Combine like terms: 0 + 8.6 = 8.6
-0.3x + x2 = 8.6

The x term is -0.3x.  Take half its coefficient (-0.15).
Square it (0.0225) and add it to both sides.

Add '0.0225' to each side of the equation.
-0.3x + 0.0225 + x2 = 8.6 + 0.0225

Reorder the terms:
0.0225 + -0.3x + x2 = 8.6 + 0.0225

Combine like terms: 8.6 + 0.0225 = 8.6225
0.0225 + -0.3x + x2 = 8.6225

Factor a perfect square on the left side:
(x + -0.15)(x + -0.15) = 8.6225

Calculate the square root of the right side: 2.936409372

Break this problem into two subproblems by setting 
(x + -0.15) equal to 2.936409372 and -2.936409372.

Subproblem 1

x + -0.15 = 2.936409372 Simplifying x + -0.15 = 2.936409372 Reorder the terms: -0.15 + x = 2.936409372 Solving -0.15 + x = 2.936409372 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '0.15' to each side of the equation. -0.15 + 0.15 + x = 2.936409372 + 0.15 Combine like terms: -0.15 + 0.15 = 0.00 0.00 + x = 2.936409372 + 0.15 x = 2.936409372 + 0.15 Combine like terms: 2.936409372 + 0.15 = 3.086409372 x = 3.086409372 Simplifying x = 3.086409372

Subproblem 2

x + -0.15 = -2.936409372 Simplifying x + -0.15 = -2.936409372 Reorder the terms: -0.15 + x = -2.936409372 Solving -0.15 + x = -2.936409372 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '0.15' to each side of the equation. -0.15 + 0.15 + x = -2.936409372 + 0.15 Combine like terms: -0.15 + 0.15 = 0.00 0.00 + x = -2.936409372 + 0.15 x = -2.936409372 + 0.15 Combine like terms: -2.936409372 + 0.15 = -2.786409372 x = -2.786409372 Simplifying x = -2.786409372

Solution

The solution to the problem is based on the solutions from the subproblems. x = {3.086409372, -2.786409372}

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