0=1.2+6.6*x+0.5*9.82*x^2

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Solution for 0=1.2+6.6*x+0.5*9.82*x^2 equation:


Simplifying
0 = 1.2 + 6.6x + 0.5 * 9.82x2

Multiply 0.5 * 9.82
0 = 1.2 + 6.6x + 4.91x2

Solving
0 = 1.2 + 6.6x + 4.91x2

Solving for variable 'x'.

Combine like terms: 0 + -1.2 = -1.2
-1.2 + -6.6x + -4.91x2 = 1.2 + 6.6x + 4.91x2 + -1.2 + -6.6x + -4.91x2

Reorder the terms:
-1.2 + -6.6x + -4.91x2 = 1.2 + -1.2 + 6.6x + -6.6x + 4.91x2 + -4.91x2

Combine like terms: 1.2 + -1.2 = 0.0
-1.2 + -6.6x + -4.91x2 = 0.0 + 6.6x + -6.6x + 4.91x2 + -4.91x2
-1.2 + -6.6x + -4.91x2 = 6.6x + -6.6x + 4.91x2 + -4.91x2

Combine like terms: 6.6x + -6.6x = 0.0
-1.2 + -6.6x + -4.91x2 = 0.0 + 4.91x2 + -4.91x2
-1.2 + -6.6x + -4.91x2 = 4.91x2 + -4.91x2

Combine like terms: 4.91x2 + -4.91x2 = 0.00
-1.2 + -6.6x + -4.91x2 = 0.00

Begin completing the square.  Divide all terms by
-4.91 the coefficient of the squared term: 

Divide each side by '-4.91'.
0.2443991853 + 1.344195519x + x2 = 0

Move the constant term to the right:

Add '-0.2443991853' to each side of the equation.
0.2443991853 + 1.344195519x + -0.2443991853 + x2 = 0 + -0.2443991853

Reorder the terms:
0.2443991853 + -0.2443991853 + 1.344195519x + x2 = 0 + -0.2443991853

Combine like terms: 0.2443991853 + -0.2443991853 = 0.0000000000
0.0000000000 + 1.344195519x + x2 = 0 + -0.2443991853
1.344195519x + x2 = 0 + -0.2443991853

Combine like terms: 0 + -0.2443991853 = -0.2443991853
1.344195519x + x2 = -0.2443991853

The x term is 1.344195519x.  Take half its coefficient (0.6720977595).
Square it (0.4517153983) and add it to both sides.

Add '0.4517153983' to each side of the equation.
1.344195519x + 0.4517153983 + x2 = -0.2443991853 + 0.4517153983

Reorder the terms:
0.4517153983 + 1.344195519x + x2 = -0.2443991853 + 0.4517153983

Combine like terms: -0.2443991853 + 0.4517153983 = 0.207316213
0.4517153983 + 1.344195519x + x2 = 0.207316213

Factor a perfect square on the left side:
(x + 0.6720977595)(x + 0.6720977595) = 0.207316213

Calculate the square root of the right side: 0.455319902

Break this problem into two subproblems by setting 
(x + 0.6720977595) equal to 0.455319902 and -0.455319902.

Subproblem 1

x + 0.6720977595 = 0.455319902 Simplifying x + 0.6720977595 = 0.455319902 Reorder the terms: 0.6720977595 + x = 0.455319902 Solving 0.6720977595 + x = 0.455319902 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-0.6720977595' to each side of the equation. 0.6720977595 + -0.6720977595 + x = 0.455319902 + -0.6720977595 Combine like terms: 0.6720977595 + -0.6720977595 = 0.0000000000 0.0000000000 + x = 0.455319902 + -0.6720977595 x = 0.455319902 + -0.6720977595 Combine like terms: 0.455319902 + -0.6720977595 = -0.2167778575 x = -0.2167778575 Simplifying x = -0.2167778575

Subproblem 2

x + 0.6720977595 = -0.455319902 Simplifying x + 0.6720977595 = -0.455319902 Reorder the terms: 0.6720977595 + x = -0.455319902 Solving 0.6720977595 + x = -0.455319902 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-0.6720977595' to each side of the equation. 0.6720977595 + -0.6720977595 + x = -0.455319902 + -0.6720977595 Combine like terms: 0.6720977595 + -0.6720977595 = 0.0000000000 0.0000000000 + x = -0.455319902 + -0.6720977595 x = -0.455319902 + -0.6720977595 Combine like terms: -0.455319902 + -0.6720977595 = -1.1274176615 x = -1.1274176615 Simplifying x = -1.1274176615

Solution

The solution to the problem is based on the solutions from the subproblems. x = {-0.2167778575, -1.1274176615}

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