2x^2=-10x-1

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


Simplifying
2x2 = -10x + -1

Reorder the terms:
2x2 = -1 + -10x

Solving
2x2 = -1 + -10x

Solving for variable 'x'.

Reorder the terms:
1 + 10x + 2x2 = -1 + -10x + 1 + 10x

Reorder the terms:
1 + 10x + 2x2 = -1 + 1 + -10x + 10x

Combine like terms: -1 + 1 = 0
1 + 10x + 2x2 = 0 + -10x + 10x
1 + 10x + 2x2 = -10x + 10x

Combine like terms: -10x + 10x = 0
1 + 10x + 2x2 = 0

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

Divide each side by '2'.
0.5 + 5x + x2 = 0

Move the constant term to the right:

Add '-0.5' to each side of the equation.
0.5 + 5x + -0.5 + x2 = 0 + -0.5

Reorder the terms:
0.5 + -0.5 + 5x + x2 = 0 + -0.5

Combine like terms: 0.5 + -0.5 = 0.0
0.0 + 5x + x2 = 0 + -0.5
5x + x2 = 0 + -0.5

Combine like terms: 0 + -0.5 = -0.5
5x + x2 = -0.5

The x term is 5x.  Take half its coefficient (2.5).
Square it (6.25) and add it to both sides.

Add '6.25' to each side of the equation.
5x + 6.25 + x2 = -0.5 + 6.25

Reorder the terms:
6.25 + 5x + x2 = -0.5 + 6.25

Combine like terms: -0.5 + 6.25 = 5.75
6.25 + 5x + x2 = 5.75

Factor a perfect square on the left side:
(x + 2.5)(x + 2.5) = 5.75

Calculate the square root of the right side: 2.397915762

Break this problem into two subproblems by setting 
(x + 2.5) equal to 2.397915762 and -2.397915762.

Subproblem 1

x + 2.5 = 2.397915762 Simplifying x + 2.5 = 2.397915762 Reorder the terms: 2.5 + x = 2.397915762 Solving 2.5 + x = 2.397915762 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-2.5' to each side of the equation. 2.5 + -2.5 + x = 2.397915762 + -2.5 Combine like terms: 2.5 + -2.5 = 0.0 0.0 + x = 2.397915762 + -2.5 x = 2.397915762 + -2.5 Combine like terms: 2.397915762 + -2.5 = -0.102084238 x = -0.102084238 Simplifying x = -0.102084238

Subproblem 2

x + 2.5 = -2.397915762 Simplifying x + 2.5 = -2.397915762 Reorder the terms: 2.5 + x = -2.397915762 Solving 2.5 + x = -2.397915762 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-2.5' to each side of the equation. 2.5 + -2.5 + x = -2.397915762 + -2.5 Combine like terms: 2.5 + -2.5 = 0.0 0.0 + x = -2.397915762 + -2.5 x = -2.397915762 + -2.5 Combine like terms: -2.397915762 + -2.5 = -4.897915762 x = -4.897915762 Simplifying x = -4.897915762

Solution

The solution to the problem is based on the solutions from the subproblems. x = {-0.102084238, -4.897915762}

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