0=4x^2+x-1

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Solution for 0=4x^2+x-1 equation:


Simplifying
0 = 4x2 + x + -1

Reorder the terms:
0 = -1 + x + 4x2

Solving
0 = -1 + x + 4x2

Solving for variable 'x'.

Combine like terms: 0 + 1 = 1
1 + -1x + -4x2 = -1 + x + 4x2 + 1 + -1x + -4x2

Reorder the terms:
1 + -1x + -4x2 = -1 + 1 + x + -1x + 4x2 + -4x2

Combine like terms: -1 + 1 = 0
1 + -1x + -4x2 = 0 + x + -1x + 4x2 + -4x2
1 + -1x + -4x2 = x + -1x + 4x2 + -4x2

Combine like terms: x + -1x = 0
1 + -1x + -4x2 = 0 + 4x2 + -4x2
1 + -1x + -4x2 = 4x2 + -4x2

Combine like terms: 4x2 + -4x2 = 0
1 + -1x + -4x2 = 0

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

Divide each side by '-4'.
-0.25 + 0.25x + x2 = 0

Move the constant term to the right:

Add '0.25' to each side of the equation.
-0.25 + 0.25x + 0.25 + x2 = 0 + 0.25

Reorder the terms:
-0.25 + 0.25 + 0.25x + x2 = 0 + 0.25

Combine like terms: -0.25 + 0.25 = 0.00
0.00 + 0.25x + x2 = 0 + 0.25
0.25x + x2 = 0 + 0.25

Combine like terms: 0 + 0.25 = 0.25
0.25x + x2 = 0.25

The x term is 0.25x.  Take half its coefficient (0.125).
Square it (0.015625) and add it to both sides.

Add '0.015625' to each side of the equation.
0.25x + 0.015625 + x2 = 0.25 + 0.015625

Reorder the terms:
0.015625 + 0.25x + x2 = 0.25 + 0.015625

Combine like terms: 0.25 + 0.015625 = 0.265625
0.015625 + 0.25x + x2 = 0.265625

Factor a perfect square on the left side:
(x + 0.125)(x + 0.125) = 0.265625

Calculate the square root of the right side: 0.515388203

Break this problem into two subproblems by setting 
(x + 0.125) equal to 0.515388203 and -0.515388203.

Subproblem 1

x + 0.125 = 0.515388203 Simplifying x + 0.125 = 0.515388203 Reorder the terms: 0.125 + x = 0.515388203 Solving 0.125 + x = 0.515388203 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-0.125' to each side of the equation. 0.125 + -0.125 + x = 0.515388203 + -0.125 Combine like terms: 0.125 + -0.125 = 0.000 0.000 + x = 0.515388203 + -0.125 x = 0.515388203 + -0.125 Combine like terms: 0.515388203 + -0.125 = 0.390388203 x = 0.390388203 Simplifying x = 0.390388203

Subproblem 2

x + 0.125 = -0.515388203 Simplifying x + 0.125 = -0.515388203 Reorder the terms: 0.125 + x = -0.515388203 Solving 0.125 + x = -0.515388203 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-0.125' to each side of the equation. 0.125 + -0.125 + x = -0.515388203 + -0.125 Combine like terms: 0.125 + -0.125 = 0.000 0.000 + x = -0.515388203 + -0.125 x = -0.515388203 + -0.125 Combine like terms: -0.515388203 + -0.125 = -0.640388203 x = -0.640388203 Simplifying x = -0.640388203

Solution

The solution to the problem is based on the solutions from the subproblems. x = {0.390388203, -0.640388203}

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