4.9x^2+.4x-1=0

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Solution for 4.9x^2+.4x-1=0 equation:


Simplifying
4.9x2 + 0.4x + -1 = 0

Reorder the terms:
-1 + 0.4x + 4.9x2 = 0

Solving
-1 + 0.4x + 4.9x2 = 0

Solving for variable 'x'.

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

Divide each side by '4.9'.
-0.2040816327 + 0.08163265306x + x2 = 0

Move the constant term to the right:

Add '0.2040816327' to each side of the equation.
-0.2040816327 + 0.08163265306x + 0.2040816327 + x2 = 0 + 0.2040816327

Reorder the terms:
-0.2040816327 + 0.2040816327 + 0.08163265306x + x2 = 0 + 0.2040816327

Combine like terms: -0.2040816327 + 0.2040816327 = 0.0000000000
0.0000000000 + 0.08163265306x + x2 = 0 + 0.2040816327
0.08163265306x + x2 = 0 + 0.2040816327

Combine like terms: 0 + 0.2040816327 = 0.2040816327
0.08163265306x + x2 = 0.2040816327

The x term is 0.08163265306x.  Take half its coefficient (0.04081632653).
Square it (0.001665972511) and add it to both sides.

Add '0.001665972511' to each side of the equation.
0.08163265306x + 0.001665972511 + x2 = 0.2040816327 + 0.001665972511

Reorder the terms:
0.001665972511 + 0.08163265306x + x2 = 0.2040816327 + 0.001665972511

Combine like terms: 0.2040816327 + 0.001665972511 = 0.205747605211
0.001665972511 + 0.08163265306x + x2 = 0.205747605211

Factor a perfect square on the left side:
(x + 0.04081632653)(x + 0.04081632653) = 0.205747605211

Calculate the square root of the right side: 0.453594097

Break this problem into two subproblems by setting 
(x + 0.04081632653) equal to 0.453594097 and -0.453594097.

Subproblem 1

x + 0.04081632653 = 0.453594097 Simplifying x + 0.04081632653 = 0.453594097 Reorder the terms: 0.04081632653 + x = 0.453594097 Solving 0.04081632653 + x = 0.453594097 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-0.04081632653' to each side of the equation. 0.04081632653 + -0.04081632653 + x = 0.453594097 + -0.04081632653 Combine like terms: 0.04081632653 + -0.04081632653 = 0.00000000000 0.00000000000 + x = 0.453594097 + -0.04081632653 x = 0.453594097 + -0.04081632653 Combine like terms: 0.453594097 + -0.04081632653 = 0.41277777047 x = 0.41277777047 Simplifying x = 0.41277777047

Subproblem 2

x + 0.04081632653 = -0.453594097 Simplifying x + 0.04081632653 = -0.453594097 Reorder the terms: 0.04081632653 + x = -0.453594097 Solving 0.04081632653 + x = -0.453594097 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-0.04081632653' to each side of the equation. 0.04081632653 + -0.04081632653 + x = -0.453594097 + -0.04081632653 Combine like terms: 0.04081632653 + -0.04081632653 = 0.00000000000 0.00000000000 + x = -0.453594097 + -0.04081632653 x = -0.453594097 + -0.04081632653 Combine like terms: -0.453594097 + -0.04081632653 = -0.49441042353 x = -0.49441042353 Simplifying x = -0.49441042353

Solution

The solution to the problem is based on the solutions from the subproblems. x = {0.41277777047, -0.49441042353}

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