0=5x^2-2x-4

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Solution for 0=5x^2-2x-4 equation:


Simplifying
0 = 5x2 + -2x + -4

Reorder the terms:
0 = -4 + -2x + 5x2

Solving
0 = -4 + -2x + 5x2

Solving for variable 'x'.

Combine like terms: 0 + 4 = 4
4 + 2x + -5x2 = -4 + -2x + 5x2 + 4 + 2x + -5x2

Reorder the terms:
4 + 2x + -5x2 = -4 + 4 + -2x + 2x + 5x2 + -5x2

Combine like terms: -4 + 4 = 0
4 + 2x + -5x2 = 0 + -2x + 2x + 5x2 + -5x2
4 + 2x + -5x2 = -2x + 2x + 5x2 + -5x2

Combine like terms: -2x + 2x = 0
4 + 2x + -5x2 = 0 + 5x2 + -5x2
4 + 2x + -5x2 = 5x2 + -5x2

Combine like terms: 5x2 + -5x2 = 0
4 + 2x + -5x2 = 0

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

Divide each side by '-5'.
-0.8 + -0.4x + x2 = 0

Move the constant term to the right:

Add '0.8' to each side of the equation.
-0.8 + -0.4x + 0.8 + x2 = 0 + 0.8

Reorder the terms:
-0.8 + 0.8 + -0.4x + x2 = 0 + 0.8

Combine like terms: -0.8 + 0.8 = 0.0
0.0 + -0.4x + x2 = 0 + 0.8
-0.4x + x2 = 0 + 0.8

Combine like terms: 0 + 0.8 = 0.8
-0.4x + x2 = 0.8

The x term is -0.4x.  Take half its coefficient (-0.2).
Square it (0.04) and add it to both sides.

Add '0.04' to each side of the equation.
-0.4x + 0.04 + x2 = 0.8 + 0.04

Reorder the terms:
0.04 + -0.4x + x2 = 0.8 + 0.04

Combine like terms: 0.8 + 0.04 = 0.84
0.04 + -0.4x + x2 = 0.84

Factor a perfect square on the left side:
(x + -0.2)(x + -0.2) = 0.84

Calculate the square root of the right side: 0.916515139

Break this problem into two subproblems by setting 
(x + -0.2) equal to 0.916515139 and -0.916515139.

Subproblem 1

x + -0.2 = 0.916515139 Simplifying x + -0.2 = 0.916515139 Reorder the terms: -0.2 + x = 0.916515139 Solving -0.2 + x = 0.916515139 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '0.2' to each side of the equation. -0.2 + 0.2 + x = 0.916515139 + 0.2 Combine like terms: -0.2 + 0.2 = 0.0 0.0 + x = 0.916515139 + 0.2 x = 0.916515139 + 0.2 Combine like terms: 0.916515139 + 0.2 = 1.116515139 x = 1.116515139 Simplifying x = 1.116515139

Subproblem 2

x + -0.2 = -0.916515139 Simplifying x + -0.2 = -0.916515139 Reorder the terms: -0.2 + x = -0.916515139 Solving -0.2 + x = -0.916515139 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '0.2' to each side of the equation. -0.2 + 0.2 + x = -0.916515139 + 0.2 Combine like terms: -0.2 + 0.2 = 0.0 0.0 + x = -0.916515139 + 0.2 x = -0.916515139 + 0.2 Combine like terms: -0.916515139 + 0.2 = -0.716515139 x = -0.716515139 Simplifying x = -0.716515139

Solution

The solution to the problem is based on the solutions from the subproblems. x = {1.116515139, -0.716515139}

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