0=4x^2+5x-5

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


Simplifying
0 = 4x2 + 5x + -5

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

Solving
0 = -5 + 5x + 4x2

Solving for variable 'x'.

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

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

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

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

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

Begin completing the square.  Divide all terms by
-4 the coefficient of the squared term: 

Divide each side by '-4'.
-1.25 + 1.25x + x2 = 0

Move the constant term to the right:

Add '1.25' to each side of the equation.
-1.25 + 1.25x + 1.25 + x2 = 0 + 1.25

Reorder the terms:
-1.25 + 1.25 + 1.25x + x2 = 0 + 1.25

Combine like terms: -1.25 + 1.25 = 0.00
0.00 + 1.25x + x2 = 0 + 1.25
1.25x + x2 = 0 + 1.25

Combine like terms: 0 + 1.25 = 1.25
1.25x + x2 = 1.25

The x term is 1.25x.  Take half its coefficient (0.625).
Square it (0.390625) and add it to both sides.

Add '0.390625' to each side of the equation.
1.25x + 0.390625 + x2 = 1.25 + 0.390625

Reorder the terms:
0.390625 + 1.25x + x2 = 1.25 + 0.390625

Combine like terms: 1.25 + 0.390625 = 1.640625
0.390625 + 1.25x + x2 = 1.640625

Factor a perfect square on the left side:
(x + 0.625)(x + 0.625) = 1.640625

Calculate the square root of the right side: 1.280868846

Break this problem into two subproblems by setting 
(x + 0.625) equal to 1.280868846 and -1.280868846.

Subproblem 1

x + 0.625 = 1.280868846 Simplifying x + 0.625 = 1.280868846 Reorder the terms: 0.625 + x = 1.280868846 Solving 0.625 + x = 1.280868846 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-0.625' to each side of the equation. 0.625 + -0.625 + x = 1.280868846 + -0.625 Combine like terms: 0.625 + -0.625 = 0.000 0.000 + x = 1.280868846 + -0.625 x = 1.280868846 + -0.625 Combine like terms: 1.280868846 + -0.625 = 0.655868846 x = 0.655868846 Simplifying x = 0.655868846

Subproblem 2

x + 0.625 = -1.280868846 Simplifying x + 0.625 = -1.280868846 Reorder the terms: 0.625 + x = -1.280868846 Solving 0.625 + x = -1.280868846 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-0.625' to each side of the equation. 0.625 + -0.625 + x = -1.280868846 + -0.625 Combine like terms: 0.625 + -0.625 = 0.000 0.000 + x = -1.280868846 + -0.625 x = -1.280868846 + -0.625 Combine like terms: -1.280868846 + -0.625 = -1.905868846 x = -1.905868846 Simplifying x = -1.905868846

Solution

The solution to the problem is based on the solutions from the subproblems. x = {0.655868846, -1.905868846}

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