4.9x^2-6x-2=0

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Solution for 4.9x^2-6x-2=0 equation:


Simplifying
4.9x2 + -6x + -2 = 0

Reorder the terms:
-2 + -6x + 4.9x2 = 0

Solving
-2 + -6x + 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'.
-0.4081632653 + -1.224489796x + x2 = 0

Move the constant term to the right:

Add '0.4081632653' to each side of the equation.
-0.4081632653 + -1.224489796x + 0.4081632653 + x2 = 0 + 0.4081632653

Reorder the terms:
-0.4081632653 + 0.4081632653 + -1.224489796x + x2 = 0 + 0.4081632653

Combine like terms: -0.4081632653 + 0.4081632653 = 0.0000000000
0.0000000000 + -1.224489796x + x2 = 0 + 0.4081632653
-1.224489796x + x2 = 0 + 0.4081632653

Combine like terms: 0 + 0.4081632653 = 0.4081632653
-1.224489796x + x2 = 0.4081632653

The x term is -1.224489796x.  Take half its coefficient (-0.612244898).
Square it (0.3748438151) and add it to both sides.

Add '0.3748438151' to each side of the equation.
-1.224489796x + 0.3748438151 + x2 = 0.4081632653 + 0.3748438151

Reorder the terms:
0.3748438151 + -1.224489796x + x2 = 0.4081632653 + 0.3748438151

Combine like terms: 0.4081632653 + 0.3748438151 = 0.7830070804
0.3748438151 + -1.224489796x + x2 = 0.7830070804

Factor a perfect square on the left side:
(x + -0.612244898)(x + -0.612244898) = 0.7830070804

Calculate the square root of the right side: 0.884876873

Break this problem into two subproblems by setting 
(x + -0.612244898) equal to 0.884876873 and -0.884876873.

Subproblem 1

x + -0.612244898 = 0.884876873 Simplifying x + -0.612244898 = 0.884876873 Reorder the terms: -0.612244898 + x = 0.884876873 Solving -0.612244898 + x = 0.884876873 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '0.612244898' to each side of the equation. -0.612244898 + 0.612244898 + x = 0.884876873 + 0.612244898 Combine like terms: -0.612244898 + 0.612244898 = 0.000000000 0.000000000 + x = 0.884876873 + 0.612244898 x = 0.884876873 + 0.612244898 Combine like terms: 0.884876873 + 0.612244898 = 1.497121771 x = 1.497121771 Simplifying x = 1.497121771

Subproblem 2

x + -0.612244898 = -0.884876873 Simplifying x + -0.612244898 = -0.884876873 Reorder the terms: -0.612244898 + x = -0.884876873 Solving -0.612244898 + x = -0.884876873 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '0.612244898' to each side of the equation. -0.612244898 + 0.612244898 + x = -0.884876873 + 0.612244898 Combine like terms: -0.612244898 + 0.612244898 = 0.000000000 0.000000000 + x = -0.884876873 + 0.612244898 x = -0.884876873 + 0.612244898 Combine like terms: -0.884876873 + 0.612244898 = -0.272631975 x = -0.272631975 Simplifying x = -0.272631975

Solution

The solution to the problem is based on the solutions from the subproblems. x = {1.497121771, -0.272631975}

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