5x^2-2=-10x

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Solution for 5x^2-2=-10x equation:


Simplifying
5x2 + -2 = -10x

Reorder the terms:
-2 + 5x2 = -10x

Solving
-2 + 5x2 = -10x

Solving for variable 'x'.

Reorder the terms:
-2 + 10x + 5x2 = -10x + 10x

Combine like terms: -10x + 10x = 0
-2 + 10x + 5x2 = 0

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

Divide each side by '5'.
-0.4 + 2x + x2 = 0

Move the constant term to the right:

Add '0.4' to each side of the equation.
-0.4 + 2x + 0.4 + x2 = 0 + 0.4

Reorder the terms:
-0.4 + 0.4 + 2x + x2 = 0 + 0.4

Combine like terms: -0.4 + 0.4 = 0.0
0.0 + 2x + x2 = 0 + 0.4
2x + x2 = 0 + 0.4

Combine like terms: 0 + 0.4 = 0.4
2x + x2 = 0.4

The x term is 2x.  Take half its coefficient (1).
Square it (1) and add it to both sides.

Add '1' to each side of the equation.
2x + 1 + x2 = 0.4 + 1

Reorder the terms:
1 + 2x + x2 = 0.4 + 1

Combine like terms: 0.4 + 1 = 1.4
1 + 2x + x2 = 1.4

Factor a perfect square on the left side:
(x + 1)(x + 1) = 1.4

Calculate the square root of the right side: 1.183215957

Break this problem into two subproblems by setting 
(x + 1) equal to 1.183215957 and -1.183215957.

Subproblem 1

x + 1 = 1.183215957 Simplifying x + 1 = 1.183215957 Reorder the terms: 1 + x = 1.183215957 Solving 1 + x = 1.183215957 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-1' to each side of the equation. 1 + -1 + x = 1.183215957 + -1 Combine like terms: 1 + -1 = 0 0 + x = 1.183215957 + -1 x = 1.183215957 + -1 Combine like terms: 1.183215957 + -1 = 0.183215957 x = 0.183215957 Simplifying x = 0.183215957

Subproblem 2

x + 1 = -1.183215957 Simplifying x + 1 = -1.183215957 Reorder the terms: 1 + x = -1.183215957 Solving 1 + x = -1.183215957 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-1' to each side of the equation. 1 + -1 + x = -1.183215957 + -1 Combine like terms: 1 + -1 = 0 0 + x = -1.183215957 + -1 x = -1.183215957 + -1 Combine like terms: -1.183215957 + -1 = -2.183215957 x = -2.183215957 Simplifying x = -2.183215957

Solution

The solution to the problem is based on the solutions from the subproblems. x = {0.183215957, -2.183215957}

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