0=-0.00625x^2+0.15x+2.5

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Solution for 0=-0.00625x^2+0.15x+2.5 equation:


Simplifying
0 = -0.00625x2 + 0.15x + 2.5

Reorder the terms:
0 = 2.5 + 0.15x + -0.00625x2

Solving
0 = 2.5 + 0.15x + -0.00625x2

Solving for variable 'x'.

Combine like terms: 0 + -2.5 = -2.5
-2.5 + -0.15x + 0.00625x2 = 2.5 + 0.15x + -0.00625x2 + -2.5 + -0.15x + 0.00625x2

Reorder the terms:
-2.5 + -0.15x + 0.00625x2 = 2.5 + -2.5 + 0.15x + -0.15x + -0.00625x2 + 0.00625x2

Combine like terms: 2.5 + -2.5 = 0.0
-2.5 + -0.15x + 0.00625x2 = 0.0 + 0.15x + -0.15x + -0.00625x2 + 0.00625x2
-2.5 + -0.15x + 0.00625x2 = 0.15x + -0.15x + -0.00625x2 + 0.00625x2

Combine like terms: 0.15x + -0.15x = 0.00
-2.5 + -0.15x + 0.00625x2 = 0.00 + -0.00625x2 + 0.00625x2
-2.5 + -0.15x + 0.00625x2 = -0.00625x2 + 0.00625x2

Combine like terms: -0.00625x2 + 0.00625x2 = 0.00000
-2.5 + -0.15x + 0.00625x2 = 0.00000

Begin completing the square.  Divide all terms by
0.00625 the coefficient of the squared term: 

Divide each side by '0.00625'.
-400 + -24x + x2 = 0

Move the constant term to the right:

Add '400' to each side of the equation.
-400 + -24x + 400 + x2 = 0 + 400

Reorder the terms:
-400 + 400 + -24x + x2 = 0 + 400

Combine like terms: -400 + 400 = 0
0 + -24x + x2 = 0 + 400
-24x + x2 = 0 + 400

Combine like terms: 0 + 400 = 400
-24x + x2 = 400

The x term is -24x.  Take half its coefficient (-12).
Square it (144) and add it to both sides.

Add '144' to each side of the equation.
-24x + 144 + x2 = 400 + 144

Reorder the terms:
144 + -24x + x2 = 400 + 144

Combine like terms: 400 + 144 = 544
144 + -24x + x2 = 544

Factor a perfect square on the left side:
(x + -12)(x + -12) = 544

Calculate the square root of the right side: 23.323807579

Break this problem into two subproblems by setting 
(x + -12) equal to 23.323807579 and -23.323807579.

Subproblem 1

x + -12 = 23.323807579 Simplifying x + -12 = 23.323807579 Reorder the terms: -12 + x = 23.323807579 Solving -12 + x = 23.323807579 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '12' to each side of the equation. -12 + 12 + x = 23.323807579 + 12 Combine like terms: -12 + 12 = 0 0 + x = 23.323807579 + 12 x = 23.323807579 + 12 Combine like terms: 23.323807579 + 12 = 35.323807579 x = 35.323807579 Simplifying x = 35.323807579

Subproblem 2

x + -12 = -23.323807579 Simplifying x + -12 = -23.323807579 Reorder the terms: -12 + x = -23.323807579 Solving -12 + x = -23.323807579 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '12' to each side of the equation. -12 + 12 + x = -23.323807579 + 12 Combine like terms: -12 + 12 = 0 0 + x = -23.323807579 + 12 x = -23.323807579 + 12 Combine like terms: -23.323807579 + 12 = -11.323807579 x = -11.323807579 Simplifying x = -11.323807579

Solution

The solution to the problem is based on the solutions from the subproblems. x = {35.323807579, -11.323807579}

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