10x^2=x+8

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Solution for 10x^2=x+8 equation:


Simplifying
10x2 = x + 8

Reorder the terms:
10x2 = 8 + x

Solving
10x2 = 8 + x

Solving for variable 'x'.

Reorder the terms:
-8 + -1x + 10x2 = 8 + x + -8 + -1x

Reorder the terms:
-8 + -1x + 10x2 = 8 + -8 + x + -1x

Combine like terms: 8 + -8 = 0
-8 + -1x + 10x2 = 0 + x + -1x
-8 + -1x + 10x2 = x + -1x

Combine like terms: x + -1x = 0
-8 + -1x + 10x2 = 0

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

Divide each side by '10'.
-0.8 + -0.1x + x2 = 0

Move the constant term to the right:

Add '0.8' to each side of the equation.
-0.8 + -0.1x + 0.8 + x2 = 0 + 0.8

Reorder the terms:
-0.8 + 0.8 + -0.1x + x2 = 0 + 0.8

Combine like terms: -0.8 + 0.8 = 0.0
0.0 + -0.1x + x2 = 0 + 0.8
-0.1x + x2 = 0 + 0.8

Combine like terms: 0 + 0.8 = 0.8
-0.1x + x2 = 0.8

The x term is -0.1x.  Take half its coefficient (-0.05).
Square it (0.0025) and add it to both sides.

Add '0.0025' to each side of the equation.
-0.1x + 0.0025 + x2 = 0.8 + 0.0025

Reorder the terms:
0.0025 + -0.1x + x2 = 0.8 + 0.0025

Combine like terms: 0.8 + 0.0025 = 0.8025
0.0025 + -0.1x + x2 = 0.8025

Factor a perfect square on the left side:
(x + -0.05)(x + -0.05) = 0.8025

Calculate the square root of the right side: 0.895823643

Break this problem into two subproblems by setting 
(x + -0.05) equal to 0.895823643 and -0.895823643.

Subproblem 1

x + -0.05 = 0.895823643 Simplifying x + -0.05 = 0.895823643 Reorder the terms: -0.05 + x = 0.895823643 Solving -0.05 + x = 0.895823643 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '0.05' to each side of the equation. -0.05 + 0.05 + x = 0.895823643 + 0.05 Combine like terms: -0.05 + 0.05 = 0.00 0.00 + x = 0.895823643 + 0.05 x = 0.895823643 + 0.05 Combine like terms: 0.895823643 + 0.05 = 0.945823643 x = 0.945823643 Simplifying x = 0.945823643

Subproblem 2

x + -0.05 = -0.895823643 Simplifying x + -0.05 = -0.895823643 Reorder the terms: -0.05 + x = -0.895823643 Solving -0.05 + x = -0.895823643 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '0.05' to each side of the equation. -0.05 + 0.05 + x = -0.895823643 + 0.05 Combine like terms: -0.05 + 0.05 = 0.00 0.00 + x = -0.895823643 + 0.05 x = -0.895823643 + 0.05 Combine like terms: -0.895823643 + 0.05 = -0.845823643 x = -0.845823643 Simplifying x = -0.845823643

Solution

The solution to the problem is based on the solutions from the subproblems. x = {0.945823643, -0.845823643}

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