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 = 0.06
0.16 + 0.8x + x2 = 0.06

Factor a perfect square on the left side:
(x + 0.4)(x + 0.4) = 0.06

Calculate the square root of the right side: 0.244948974

Break this problem into two subproblems by setting 
(x + 0.4) equal to 0.244948974 and -0.244948974.

Subproblem 1

x + 0.4 = 0.244948974 Simplifying x + 0.4 = 0.244948974 Reorder the terms: 0.4 + x = 0.244948974 Solving 0.4 + x = 0.244948974 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 = 0.244948974 + -0.4 Combine like terms: 0.4 + -0.4 = 0.0 0.0 + x = 0.244948974 + -0.4 x = 0.244948974 + -0.4 Combine like terms: 0.244948974 + -0.4 = -0.155051026 x = -0.155051026 Simplifying x = -0.155051026

Subproblem 2

x + 0.4 = -0.244948974 Simplifying x + 0.4 = -0.244948974 Reorder the terms: 0.4 + x = -0.244948974 Solving 0.4 + x = -0.244948974 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 = -0.244948974 + -0.4 Combine like terms: 0.4 + -0.4 = 0.0 0.0 + x = -0.244948974 + -0.4 x = -0.244948974 + -0.4 Combine like terms: -0.244948974 + -0.4 = -0.644948974 x = -0.644948974 Simplifying x = -0.644948974

Solution

The solution to the problem is based on the solutions from the subproblems. x = {-0.155051026, -0.644948974}

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