0=2.15+9.6x+(.5)(-9.81)(x^2)

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Solution for 0=2.15+9.6x+(.5)(-9.81)(x^2) equation:


Simplifying
0 = 2.15 + 9.6x + (0.5)(-9.81)(x2)

Multiply 0.5 * -9.81
0 = 2.15 + 9.6x + -4.905x2

Solving
0 = 2.15 + 9.6x + -4.905x2

Solving for variable 'x'.

Combine like terms: 0 + -2.15 = -2.15
-2.15 + -9.6x + 4.905x2 = 2.15 + 9.6x + -4.905x2 + -2.15 + -9.6x + 4.905x2

Reorder the terms:
-2.15 + -9.6x + 4.905x2 = 2.15 + -2.15 + 9.6x + -9.6x + -4.905x2 + 4.905x2

Combine like terms: 2.15 + -2.15 = 0.00
-2.15 + -9.6x + 4.905x2 = 0.00 + 9.6x + -9.6x + -4.905x2 + 4.905x2
-2.15 + -9.6x + 4.905x2 = 9.6x + -9.6x + -4.905x2 + 4.905x2

Combine like terms: 9.6x + -9.6x = 0.0
-2.15 + -9.6x + 4.905x2 = 0.0 + -4.905x2 + 4.905x2
-2.15 + -9.6x + 4.905x2 = -4.905x2 + 4.905x2

Combine like terms: -4.905x2 + 4.905x2 = 0.000
-2.15 + -9.6x + 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'.
-0.4383282365 + -1.957186544x + x2 = 0

Move the constant term to the right:

Add '0.4383282365' to each side of the equation.
-0.4383282365 + -1.957186544x + 0.4383282365 + x2 = 0 + 0.4383282365

Reorder the terms:
-0.4383282365 + 0.4383282365 + -1.957186544x + x2 = 0 + 0.4383282365

Combine like terms: -0.4383282365 + 0.4383282365 = 0.0000000000
0.0000000000 + -1.957186544x + x2 = 0 + 0.4383282365
-1.957186544x + x2 = 0 + 0.4383282365

Combine like terms: 0 + 0.4383282365 = 0.4383282365
-1.957186544x + x2 = 0.4383282365

The x term is -1.957186544x.  Take half its coefficient (-0.978593272).
Square it (0.9576447920) and add it to both sides.

Add '0.9576447920' to each side of the equation.
-1.957186544x + 0.9576447920 + x2 = 0.4383282365 + 0.9576447920

Reorder the terms:
0.9576447920 + -1.957186544x + x2 = 0.4383282365 + 0.9576447920

Combine like terms: 0.4383282365 + 0.9576447920 = 1.3959730285
0.9576447920 + -1.957186544x + x2 = 1.3959730285

Factor a perfect square on the left side:
(x + -0.978593272)(x + -0.978593272) = 1.3959730285

Calculate the square root of the right side: 1.181513025

Break this problem into two subproblems by setting 
(x + -0.978593272) equal to 1.181513025 and -1.181513025.

Subproblem 1

x + -0.978593272 = 1.181513025 Simplifying x + -0.978593272 = 1.181513025 Reorder the terms: -0.978593272 + x = 1.181513025 Solving -0.978593272 + x = 1.181513025 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '0.978593272' to each side of the equation. -0.978593272 + 0.978593272 + x = 1.181513025 + 0.978593272 Combine like terms: -0.978593272 + 0.978593272 = 0.000000000 0.000000000 + x = 1.181513025 + 0.978593272 x = 1.181513025 + 0.978593272 Combine like terms: 1.181513025 + 0.978593272 = 2.160106297 x = 2.160106297 Simplifying x = 2.160106297

Subproblem 2

x + -0.978593272 = -1.181513025 Simplifying x + -0.978593272 = -1.181513025 Reorder the terms: -0.978593272 + x = -1.181513025 Solving -0.978593272 + x = -1.181513025 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '0.978593272' to each side of the equation. -0.978593272 + 0.978593272 + x = -1.181513025 + 0.978593272 Combine like terms: -0.978593272 + 0.978593272 = 0.000000000 0.000000000 + x = -1.181513025 + 0.978593272 x = -1.181513025 + 0.978593272 Combine like terms: -1.181513025 + 0.978593272 = -0.202919753 x = -0.202919753 Simplifying x = -0.202919753

Solution

The solution to the problem is based on the solutions from the subproblems. x = {2.160106297, -0.202919753}

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