0=-50+31.304x+4.9x^2

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Solution for 0=-50+31.304x+4.9x^2 equation:


Simplifying
0 = -50 + 31.304x + 4.9x2

Solving
0 = -50 + 31.304x + 4.9x2

Solving for variable 'x'.

Combine like terms: 0 + 50 = 50
50 + -31.304x + -4.9x2 = -50 + 31.304x + 4.9x2 + 50 + -31.304x + -4.9x2

Reorder the terms:
50 + -31.304x + -4.9x2 = -50 + 50 + 31.304x + -31.304x + 4.9x2 + -4.9x2

Combine like terms: -50 + 50 = 0
50 + -31.304x + -4.9x2 = 0 + 31.304x + -31.304x + 4.9x2 + -4.9x2
50 + -31.304x + -4.9x2 = 31.304x + -31.304x + 4.9x2 + -4.9x2

Combine like terms: 31.304x + -31.304x = 0.000
50 + -31.304x + -4.9x2 = 0.000 + 4.9x2 + -4.9x2
50 + -31.304x + -4.9x2 = 4.9x2 + -4.9x2

Combine like terms: 4.9x2 + -4.9x2 = 0.0
50 + -31.304x + -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'.
-10.20408163 + 6.388571429x + x2 = 0

Move the constant term to the right:

Add '10.20408163' to each side of the equation.
-10.20408163 + 6.388571429x + 10.20408163 + x2 = 0 + 10.20408163

Reorder the terms:
-10.20408163 + 10.20408163 + 6.388571429x + x2 = 0 + 10.20408163

Combine like terms: -10.20408163 + 10.20408163 = 0.00000000
0.00000000 + 6.388571429x + x2 = 0 + 10.20408163
6.388571429x + x2 = 0 + 10.20408163

Combine like terms: 0 + 10.20408163 = 10.20408163
6.388571429x + x2 = 10.20408163

The x term is 6.388571429x.  Take half its coefficient (3.194285715).
Square it (10.20346123) and add it to both sides.

Add '10.20346123' to each side of the equation.
6.388571429x + 10.20346123 + x2 = 10.20408163 + 10.20346123

Reorder the terms:
10.20346123 + 6.388571429x + x2 = 10.20408163 + 10.20346123

Combine like terms: 10.20408163 + 10.20346123 = 20.40754286
10.20346123 + 6.388571429x + x2 = 20.40754286

Factor a perfect square on the left side:
(x + 3.194285715)(x + 3.194285715) = 20.40754286

Calculate the square root of the right side: 4.517470848

Break this problem into two subproblems by setting 
(x + 3.194285715) equal to 4.517470848 and -4.517470848.

Subproblem 1

x + 3.194285715 = 4.517470848 Simplifying x + 3.194285715 = 4.517470848 Reorder the terms: 3.194285715 + x = 4.517470848 Solving 3.194285715 + x = 4.517470848 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-3.194285715' to each side of the equation. 3.194285715 + -3.194285715 + x = 4.517470848 + -3.194285715 Combine like terms: 3.194285715 + -3.194285715 = 0.000000000 0.000000000 + x = 4.517470848 + -3.194285715 x = 4.517470848 + -3.194285715 Combine like terms: 4.517470848 + -3.194285715 = 1.323185133 x = 1.323185133 Simplifying x = 1.323185133

Subproblem 2

x + 3.194285715 = -4.517470848 Simplifying x + 3.194285715 = -4.517470848 Reorder the terms: 3.194285715 + x = -4.517470848 Solving 3.194285715 + x = -4.517470848 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-3.194285715' to each side of the equation. 3.194285715 + -3.194285715 + x = -4.517470848 + -3.194285715 Combine like terms: 3.194285715 + -3.194285715 = 0.000000000 0.000000000 + x = -4.517470848 + -3.194285715 x = -4.517470848 + -3.194285715 Combine like terms: -4.517470848 + -3.194285715 = -7.711756563 x = -7.711756563 Simplifying x = -7.711756563

Solution

The solution to the problem is based on the solutions from the subproblems. x = {1.323185133, -7.711756563}

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