.5=3.13x+4.905*(x^2)

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Solution for .5=3.13x+4.905*(x^2) equation:


Simplifying
0.5 = 3.13x + 4.905(x2)

Solving
0.5 = 3.13x + 4.905x2

Solving for variable 'x'.

Reorder the terms:
0.5 + -3.13x + -4.905x2 = 3.13x + -3.13x + 4.905x2 + -4.905x2

Combine like terms: 3.13x + -3.13x = 0.00
0.5 + -3.13x + -4.905x2 = 0.00 + 4.905x2 + -4.905x2
0.5 + -3.13x + -4.905x2 = 4.905x2 + -4.905x2

Combine like terms: 4.905x2 + -4.905x2 = 0.000
0.5 + -3.13x + -4.905x2 = 0.000

Begin completing the square.  Divide all terms by
-4.905 the coefficient of the squared term: 

Divide each side by '-4.905'.
-0.1019367992 + 0.6381243629x + x2 = 0

Move the constant term to the right:

Add '0.1019367992' to each side of the equation.
-0.1019367992 + 0.6381243629x + 0.1019367992 + x2 = 0 + 0.1019367992

Reorder the terms:
-0.1019367992 + 0.1019367992 + 0.6381243629x + x2 = 0 + 0.1019367992

Combine like terms: -0.1019367992 + 0.1019367992 = 0.0000000000
0.0000000000 + 0.6381243629x + x2 = 0 + 0.1019367992
0.6381243629x + x2 = 0 + 0.1019367992

Combine like terms: 0 + 0.1019367992 = 0.1019367992
0.6381243629x + x2 = 0.1019367992

The x term is 0.6381243629x.  Take half its coefficient (0.3190621815).
Square it (0.1018006757) and add it to both sides.

Add '0.1018006757' to each side of the equation.
0.6381243629x + 0.1018006757 + x2 = 0.1019367992 + 0.1018006757

Reorder the terms:
0.1018006757 + 0.6381243629x + x2 = 0.1019367992 + 0.1018006757

Combine like terms: 0.1019367992 + 0.1018006757 = 0.2037374749
0.1018006757 + 0.6381243629x + x2 = 0.2037374749

Factor a perfect square on the left side:
(x + 0.3190621815)(x + 0.3190621815) = 0.2037374749

Calculate the square root of the right side: 0.451372878

Break this problem into two subproblems by setting 
(x + 0.3190621815) equal to 0.451372878 and -0.451372878.

Subproblem 1

x + 0.3190621815 = 0.451372878 Simplifying x + 0.3190621815 = 0.451372878 Reorder the terms: 0.3190621815 + x = 0.451372878 Solving 0.3190621815 + x = 0.451372878 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-0.3190621815' to each side of the equation. 0.3190621815 + -0.3190621815 + x = 0.451372878 + -0.3190621815 Combine like terms: 0.3190621815 + -0.3190621815 = 0.0000000000 0.0000000000 + x = 0.451372878 + -0.3190621815 x = 0.451372878 + -0.3190621815 Combine like terms: 0.451372878 + -0.3190621815 = 0.1323106965 x = 0.1323106965 Simplifying x = 0.1323106965

Subproblem 2

x + 0.3190621815 = -0.451372878 Simplifying x + 0.3190621815 = -0.451372878 Reorder the terms: 0.3190621815 + x = -0.451372878 Solving 0.3190621815 + x = -0.451372878 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-0.3190621815' to each side of the equation. 0.3190621815 + -0.3190621815 + x = -0.451372878 + -0.3190621815 Combine like terms: 0.3190621815 + -0.3190621815 = 0.0000000000 0.0000000000 + x = -0.451372878 + -0.3190621815 x = -0.451372878 + -0.3190621815 Combine like terms: -0.451372878 + -0.3190621815 = -0.7704350595 x = -0.7704350595 Simplifying x = -0.7704350595

Solution

The solution to the problem is based on the solutions from the subproblems. x = {0.1323106965, -0.7704350595}

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