10x^2-1=8x

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Solution for 10x^2-1=8x equation:


Simplifying
10x2 + -1 = 8x

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

Solving
-1 + 10x2 = 8x

Solving for variable 'x'.

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

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

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

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

Move the constant term to the right:

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

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

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

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

The x term is -0.8x.  Take half its coefficient (-0.4).
Square it (0.16) and add it to both sides.

Add '0.16' to each side of the equation.
-0.8x + 0.16 + x2 = 0.1 + 0.16

Reorder the terms:
0.16 + -0.8x + x2 = 0.1 + 0.16

Combine like terms: 0.1 + 0.16 = 0.26
0.16 + -0.8x + x2 = 0.26

Factor a perfect square on the left side:
(x + -0.4)(x + -0.4) = 0.26

Calculate the square root of the right side: 0.509901951

Break this problem into two subproblems by setting 
(x + -0.4) equal to 0.509901951 and -0.509901951.

Subproblem 1

x + -0.4 = 0.509901951 Simplifying x + -0.4 = 0.509901951 Reorder the terms: -0.4 + x = 0.509901951 Solving -0.4 + x = 0.509901951 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '0.4' to each side of the equation. -0.4 + 0.4 + x = 0.509901951 + 0.4 Combine like terms: -0.4 + 0.4 = 0.0 0.0 + x = 0.509901951 + 0.4 x = 0.509901951 + 0.4 Combine like terms: 0.509901951 + 0.4 = 0.909901951 x = 0.909901951 Simplifying x = 0.909901951

Subproblem 2

x + -0.4 = -0.509901951 Simplifying x + -0.4 = -0.509901951 Reorder the terms: -0.4 + x = -0.509901951 Solving -0.4 + x = -0.509901951 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '0.4' to each side of the equation. -0.4 + 0.4 + x = -0.509901951 + 0.4 Combine like terms: -0.4 + 0.4 = 0.0 0.0 + x = -0.509901951 + 0.4 x = -0.509901951 + 0.4 Combine like terms: -0.509901951 + 0.4 = -0.109901951 x = -0.109901951 Simplifying x = -0.109901951

Solution

The solution to the problem is based on the solutions from the subproblems. x = {0.909901951, -0.109901951}

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