0=5x^2-4x-4

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


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

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

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

Solving for variable 'x'.

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

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

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

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

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

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

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

Move the constant term to the right:

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

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

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

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

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 = 0.8 + 0.16

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

Combine like terms: 0.8 + 0.16 = 0.96
0.16 + -0.8x + x2 = 0.96

Factor a perfect square on the left side:
(x + -0.4)(x + -0.4) = 0.96

Calculate the square root of the right side: 0.979795897

Break this problem into two subproblems by setting 
(x + -0.4) equal to 0.979795897 and -0.979795897.

Subproblem 1

x + -0.4 = 0.979795897 Simplifying x + -0.4 = 0.979795897 Reorder the terms: -0.4 + x = 0.979795897 Solving -0.4 + x = 0.979795897 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 = 0.979795897 + 0.4 Combine like terms: -0.4 + 0.4 = 0.0 0.0 + x = 0.979795897 + 0.4 x = 0.979795897 + 0.4 Combine like terms: 0.979795897 + 0.4 = 1.379795897 x = 1.379795897 Simplifying x = 1.379795897

Subproblem 2

x + -0.4 = -0.979795897 Simplifying x + -0.4 = -0.979795897 Reorder the terms: -0.4 + x = -0.979795897 Solving -0.4 + x = -0.979795897 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 = -0.979795897 + 0.4 Combine like terms: -0.4 + 0.4 = 0.0 0.0 + x = -0.979795897 + 0.4 x = -0.979795897 + 0.4 Combine like terms: -0.979795897 + 0.4 = -0.579795897 x = -0.579795897 Simplifying x = -0.579795897

Solution

The solution to the problem is based on the solutions from the subproblems. x = {1.379795897, -0.579795897}

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