0=4X^2+X-2

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Solution for 0=4X^2+X-2 equation:


Simplifying
0 = 4X2 + X + -2

Reorder the terms:
0 = -2 + X + 4X2

Solving
0 = -2 + X + 4X2

Solving for variable 'X'.

Combine like terms: 0 + 2 = 2
2 + -1X + -4X2 = -2 + X + 4X2 + 2 + -1X + -4X2

Reorder the terms:
2 + -1X + -4X2 = -2 + 2 + X + -1X + 4X2 + -4X2

Combine like terms: -2 + 2 = 0
2 + -1X + -4X2 = 0 + X + -1X + 4X2 + -4X2
2 + -1X + -4X2 = X + -1X + 4X2 + -4X2

Combine like terms: X + -1X = 0
2 + -1X + -4X2 = 0 + 4X2 + -4X2
2 + -1X + -4X2 = 4X2 + -4X2

Combine like terms: 4X2 + -4X2 = 0
2 + -1X + -4X2 = 0

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

Divide each side by '-4'.
-0.5 + 0.25X + X2 = 0

Move the constant term to the right:

Add '0.5' to each side of the equation.
-0.5 + 0.25X + 0.5 + X2 = 0 + 0.5

Reorder the terms:
-0.5 + 0.5 + 0.25X + X2 = 0 + 0.5

Combine like terms: -0.5 + 0.5 = 0.0
0.0 + 0.25X + X2 = 0 + 0.5
0.25X + X2 = 0 + 0.5

Combine like terms: 0 + 0.5 = 0.5
0.25X + X2 = 0.5

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 = 0.5 + 0.015625

Reorder the terms:
0.015625 + 0.25X + X2 = 0.5 + 0.015625

Combine like terms: 0.5 + 0.015625 = 0.515625
0.015625 + 0.25X + X2 = 0.515625

Factor a perfect square on the left side:
(X + 0.125)(X + 0.125) = 0.515625

Calculate the square root of the right side: 0.718070331

Break this problem into two subproblems by setting 
(X + 0.125) equal to 0.718070331 and -0.718070331.

Subproblem 1

X + 0.125 = 0.718070331 Simplifying X + 0.125 = 0.718070331 Reorder the terms: 0.125 + X = 0.718070331 Solving 0.125 + X = 0.718070331 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 = 0.718070331 + -0.125 Combine like terms: 0.125 + -0.125 = 0.000 0.000 + X = 0.718070331 + -0.125 X = 0.718070331 + -0.125 Combine like terms: 0.718070331 + -0.125 = 0.593070331 X = 0.593070331 Simplifying X = 0.593070331

Subproblem 2

X + 0.125 = -0.718070331 Simplifying X + 0.125 = -0.718070331 Reorder the terms: 0.125 + X = -0.718070331 Solving 0.125 + X = -0.718070331 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 = -0.718070331 + -0.125 Combine like terms: 0.125 + -0.125 = 0.000 0.000 + X = -0.718070331 + -0.125 X = -0.718070331 + -0.125 Combine like terms: -0.718070331 + -0.125 = -0.843070331 X = -0.843070331 Simplifying X = -0.843070331

Solution

The solution to the problem is based on the solutions from the subproblems. X = {0.593070331, -0.843070331}

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