8.156x^2-5.7092x+0.97872=0

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Solution for 8.156x^2-5.7092x+0.97872=0 equation:


Simplifying
8.156x2 + -5.7092x + 0.97872 = 0

Reorder the terms:
0.97872 + -5.7092x + 8.156x2 = 0

Solving
0.97872 + -5.7092x + 8.156x2 = 0

Solving for variable 'x'.

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

Divide each side by '8.156'.
0.12 + -0.7x + x2 = 0

Move the constant term to the right:

Add '-0.12' to each side of the equation.
0.12 + -0.7x + -0.12 + x2 = 0 + -0.12

Reorder the terms:
0.12 + -0.12 + -0.7x + x2 = 0 + -0.12

Combine like terms: 0.12 + -0.12 = 0.00
0.00 + -0.7x + x2 = 0 + -0.12
-0.7x + x2 = 0 + -0.12

Combine like terms: 0 + -0.12 = -0.12
-0.7x + x2 = -0.12

The x term is -0.7x.  Take half its coefficient (-0.35).
Square it (0.1225) and add it to both sides.

Add '0.1225' to each side of the equation.
-0.7x + 0.1225 + x2 = -0.12 + 0.1225

Reorder the terms:
0.1225 + -0.7x + x2 = -0.12 + 0.1225

Combine like terms: -0.12 + 0.1225 = 0.0025
0.1225 + -0.7x + x2 = 0.0025

Factor a perfect square on the left side:
(x + -0.35)(x + -0.35) = 0.0025

Calculate the square root of the right side: 0.05

Break this problem into two subproblems by setting 
(x + -0.35) equal to 0.05 and -0.05.

Subproblem 1

x + -0.35 = 0.05 Simplifying x + -0.35 = 0.05 Reorder the terms: -0.35 + x = 0.05 Solving -0.35 + x = 0.05 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '0.35' to each side of the equation. -0.35 + 0.35 + x = 0.05 + 0.35 Combine like terms: -0.35 + 0.35 = 0.00 0.00 + x = 0.05 + 0.35 x = 0.05 + 0.35 Combine like terms: 0.05 + 0.35 = 0.4 x = 0.4 Simplifying x = 0.4

Subproblem 2

x + -0.35 = -0.05 Simplifying x + -0.35 = -0.05 Reorder the terms: -0.35 + x = -0.05 Solving -0.35 + x = -0.05 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '0.35' to each side of the equation. -0.35 + 0.35 + x = -0.05 + 0.35 Combine like terms: -0.35 + 0.35 = 0.00 0.00 + x = -0.05 + 0.35 x = -0.05 + 0.35 Combine like terms: -0.05 + 0.35 = 0.3 x = 0.3 Simplifying x = 0.3

Solution

The solution to the problem is based on the solutions from the subproblems. x = {0.4, 0.3}

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