.204=2(x)+4.9(x^2)

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Solution for .204=2(x)+4.9(x^2) equation:


Simplifying
0.204 = 2(x) + 4.9(x2)

Solving
0.204 = 2x + 4.9x2

Solving for variable 'x'.

Reorder the terms:
0.204 + -2x + -4.9x2 = 2x + -2x + 4.9x2 + -4.9x2

Combine like terms: 2x + -2x = 0
0.204 + -2x + -4.9x2 = 0 + 4.9x2 + -4.9x2
0.204 + -2x + -4.9x2 = 4.9x2 + -4.9x2

Combine like terms: 4.9x2 + -4.9x2 = 0.0
0.204 + -2x + -4.9x2 = 0.0

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

Divide each side by '-4.9'.
-0.04163265306 + 0.4081632653x + x2 = 0

Move the constant term to the right:

Add '0.04163265306' to each side of the equation.
-0.04163265306 + 0.4081632653x + 0.04163265306 + x2 = 0 + 0.04163265306

Reorder the terms:
-0.04163265306 + 0.04163265306 + 0.4081632653x + x2 = 0 + 0.04163265306

Combine like terms: -0.04163265306 + 0.04163265306 = 0.00000000000
0.00000000000 + 0.4081632653x + x2 = 0 + 0.04163265306
0.4081632653x + x2 = 0 + 0.04163265306

Combine like terms: 0 + 0.04163265306 = 0.04163265306
0.4081632653x + x2 = 0.04163265306

The x term is 0.4081632653x.  Take half its coefficient (0.2040816327).
Square it (0.04164931281) and add it to both sides.

Add '0.04164931281' to each side of the equation.
0.4081632653x + 0.04164931281 + x2 = 0.04163265306 + 0.04164931281

Reorder the terms:
0.04164931281 + 0.4081632653x + x2 = 0.04163265306 + 0.04164931281

Combine like terms: 0.04163265306 + 0.04164931281 = 0.08328196587
0.04164931281 + 0.4081632653x + x2 = 0.08328196587

Factor a perfect square on the left side:
(x + 0.2040816327)(x + 0.2040816327) = 0.08328196587

Calculate the square root of the right side: 0.28858615

Break this problem into two subproblems by setting 
(x + 0.2040816327) equal to 0.28858615 and -0.28858615.

Subproblem 1

x + 0.2040816327 = 0.28858615 Simplifying x + 0.2040816327 = 0.28858615 Reorder the terms: 0.2040816327 + x = 0.28858615 Solving 0.2040816327 + x = 0.28858615 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-0.2040816327' to each side of the equation. 0.2040816327 + -0.2040816327 + x = 0.28858615 + -0.2040816327 Combine like terms: 0.2040816327 + -0.2040816327 = 0.0000000000 0.0000000000 + x = 0.28858615 + -0.2040816327 x = 0.28858615 + -0.2040816327 Combine like terms: 0.28858615 + -0.2040816327 = 0.0845045173 x = 0.0845045173 Simplifying x = 0.0845045173

Subproblem 2

x + 0.2040816327 = -0.28858615 Simplifying x + 0.2040816327 = -0.28858615 Reorder the terms: 0.2040816327 + x = -0.28858615 Solving 0.2040816327 + x = -0.28858615 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-0.2040816327' to each side of the equation. 0.2040816327 + -0.2040816327 + x = -0.28858615 + -0.2040816327 Combine like terms: 0.2040816327 + -0.2040816327 = 0.0000000000 0.0000000000 + x = -0.28858615 + -0.2040816327 x = -0.28858615 + -0.2040816327 Combine like terms: -0.28858615 + -0.2040816327 = -0.4926677827 x = -0.4926677827 Simplifying x = -0.4926677827

Solution

The solution to the problem is based on the solutions from the subproblems. x = {0.0845045173, -0.4926677827}

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