0=10+4.9x-4.9x^2

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Solution for 0=10+4.9x-4.9x^2 equation:


Simplifying
0 = 10 + 4.9x + -4.9x2

Solving
0 = 10 + 4.9x + -4.9x2

Solving for variable 'x'.

Combine like terms: 0 + -10 = -10
-10 + -4.9x + 4.9x2 = 10 + 4.9x + -4.9x2 + -10 + -4.9x + 4.9x2

Reorder the terms:
-10 + -4.9x + 4.9x2 = 10 + -10 + 4.9x + -4.9x + -4.9x2 + 4.9x2

Combine like terms: 10 + -10 = 0
-10 + -4.9x + 4.9x2 = 0 + 4.9x + -4.9x + -4.9x2 + 4.9x2
-10 + -4.9x + 4.9x2 = 4.9x + -4.9x + -4.9x2 + 4.9x2

Combine like terms: 4.9x + -4.9x = 0.0
-10 + -4.9x + 4.9x2 = 0.0 + -4.9x2 + 4.9x2
-10 + -4.9x + 4.9x2 = -4.9x2 + 4.9x2

Combine like terms: -4.9x2 + 4.9x2 = 0.0
-10 + -4.9x + 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'.
-2.040816327 + -1x + x2 = 0

Move the constant term to the right:

Add '2.040816327' to each side of the equation.
-2.040816327 + -1x + 2.040816327 + x2 = 0 + 2.040816327

Reorder the terms:
-2.040816327 + 2.040816327 + -1x + x2 = 0 + 2.040816327

Combine like terms: -2.040816327 + 2.040816327 = 0.000000000
0.000000000 + -1x + x2 = 0 + 2.040816327
-1x + x2 = 0 + 2.040816327

Combine like terms: 0 + 2.040816327 = 2.040816327
-1x + x2 = 2.040816327

The x term is -1x.  Take half its coefficient (-0.5).
Square it (0.25) and add it to both sides.

Add '0.25' to each side of the equation.
-1x + 0.25 + x2 = 2.040816327 + 0.25

Reorder the terms:
0.25 + -1x + x2 = 2.040816327 + 0.25

Combine like terms: 2.040816327 + 0.25 = 2.290816327
0.25 + -1x + x2 = 2.290816327

Factor a perfect square on the left side:
(x + -0.5)(x + -0.5) = 2.290816327

Calculate the square root of the right side: 1.513544293

Break this problem into two subproblems by setting 
(x + -0.5) equal to 1.513544293 and -1.513544293.

Subproblem 1

x + -0.5 = 1.513544293 Simplifying x + -0.5 = 1.513544293 Reorder the terms: -0.5 + x = 1.513544293 Solving -0.5 + x = 1.513544293 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '0.5' to each side of the equation. -0.5 + 0.5 + x = 1.513544293 + 0.5 Combine like terms: -0.5 + 0.5 = 0.0 0.0 + x = 1.513544293 + 0.5 x = 1.513544293 + 0.5 Combine like terms: 1.513544293 + 0.5 = 2.013544293 x = 2.013544293 Simplifying x = 2.013544293

Subproblem 2

x + -0.5 = -1.513544293 Simplifying x + -0.5 = -1.513544293 Reorder the terms: -0.5 + x = -1.513544293 Solving -0.5 + x = -1.513544293 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '0.5' to each side of the equation. -0.5 + 0.5 + x = -1.513544293 + 0.5 Combine like terms: -0.5 + 0.5 = 0.0 0.0 + x = -1.513544293 + 0.5 x = -1.513544293 + 0.5 Combine like terms: -1.513544293 + 0.5 = -1.013544293 x = -1.013544293 Simplifying x = -1.013544293

Solution

The solution to the problem is based on the solutions from the subproblems. x = {2.013544293, -1.013544293}

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