0=60+12.5x-4.9x^2

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Solution for 0=60+12.5x-4.9x^2 equation:


Simplifying
0 = 60 + 12.5x + -4.9x2

Solving
0 = 60 + 12.5x + -4.9x2

Solving for variable 'x'.

Combine like terms: 0 + -60 = -60
-60 + -12.5x + 4.9x2 = 60 + 12.5x + -4.9x2 + -60 + -12.5x + 4.9x2

Reorder the terms:
-60 + -12.5x + 4.9x2 = 60 + -60 + 12.5x + -12.5x + -4.9x2 + 4.9x2

Combine like terms: 60 + -60 = 0
-60 + -12.5x + 4.9x2 = 0 + 12.5x + -12.5x + -4.9x2 + 4.9x2
-60 + -12.5x + 4.9x2 = 12.5x + -12.5x + -4.9x2 + 4.9x2

Combine like terms: 12.5x + -12.5x = 0.0
-60 + -12.5x + 4.9x2 = 0.0 + -4.9x2 + 4.9x2
-60 + -12.5x + 4.9x2 = -4.9x2 + 4.9x2

Combine like terms: -4.9x2 + 4.9x2 = 0.0
-60 + -12.5x + 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'.
-12.24489796 + -2.551020408x + x2 = 0

Move the constant term to the right:

Add '12.24489796' to each side of the equation.
-12.24489796 + -2.551020408x + 12.24489796 + x2 = 0 + 12.24489796

Reorder the terms:
-12.24489796 + 12.24489796 + -2.551020408x + x2 = 0 + 12.24489796

Combine like terms: -12.24489796 + 12.24489796 = 0.00000000
0.00000000 + -2.551020408x + x2 = 0 + 12.24489796
-2.551020408x + x2 = 0 + 12.24489796

Combine like terms: 0 + 12.24489796 = 12.24489796
-2.551020408x + x2 = 12.24489796

The x term is -2.551020408x.  Take half its coefficient (-1.275510204).
Square it (1.626926281) and add it to both sides.

Add '1.626926281' to each side of the equation.
-2.551020408x + 1.626926281 + x2 = 12.24489796 + 1.626926281

Reorder the terms:
1.626926281 + -2.551020408x + x2 = 12.24489796 + 1.626926281

Combine like terms: 12.24489796 + 1.626926281 = 13.871824241
1.626926281 + -2.551020408x + x2 = 13.871824241

Factor a perfect square on the left side:
(x + -1.275510204)(x + -1.275510204) = 13.871824241

Calculate the square root of the right side: 3.724489796

Break this problem into two subproblems by setting 
(x + -1.275510204) equal to 3.724489796 and -3.724489796.

Subproblem 1

x + -1.275510204 = 3.724489796 Simplifying x + -1.275510204 = 3.724489796 Reorder the terms: -1.275510204 + x = 3.724489796 Solving -1.275510204 + x = 3.724489796 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '1.275510204' to each side of the equation. -1.275510204 + 1.275510204 + x = 3.724489796 + 1.275510204 Combine like terms: -1.275510204 + 1.275510204 = 0.000000000 0.000000000 + x = 3.724489796 + 1.275510204 x = 3.724489796 + 1.275510204 Combine like terms: 3.724489796 + 1.275510204 = 5 x = 5 Simplifying x = 5

Subproblem 2

x + -1.275510204 = -3.724489796 Simplifying x + -1.275510204 = -3.724489796 Reorder the terms: -1.275510204 + x = -3.724489796 Solving -1.275510204 + x = -3.724489796 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '1.275510204' to each side of the equation. -1.275510204 + 1.275510204 + x = -3.724489796 + 1.275510204 Combine like terms: -1.275510204 + 1.275510204 = 0.000000000 0.000000000 + x = -3.724489796 + 1.275510204 x = -3.724489796 + 1.275510204 Combine like terms: -3.724489796 + 1.275510204 = -2.448979592 x = -2.448979592 Simplifying x = -2.448979592

Solution

The solution to the problem is based on the solutions from the subproblems. x = {5, -2.448979592}

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