x=-0.125x^2+5.75x+71

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Solution for x=-0.125x^2+5.75x+71 equation:


Simplifying
x = -0.125x2 + 5.75x + 71

Reorder the terms:
x = 71 + 5.75x + -0.125x2

Solving
x = 71 + 5.75x + -0.125x2

Solving for variable 'x'.

Reorder the terms:
-71 + x + -5.75x + 0.125x2 = 71 + 5.75x + -0.125x2 + -71 + -5.75x + 0.125x2

Combine like terms: x + -5.75x = -4.75x
-71 + -4.75x + 0.125x2 = 71 + 5.75x + -0.125x2 + -71 + -5.75x + 0.125x2

Reorder the terms:
-71 + -4.75x + 0.125x2 = 71 + -71 + 5.75x + -5.75x + -0.125x2 + 0.125x2

Combine like terms: 71 + -71 = 0
-71 + -4.75x + 0.125x2 = 0 + 5.75x + -5.75x + -0.125x2 + 0.125x2
-71 + -4.75x + 0.125x2 = 5.75x + -5.75x + -0.125x2 + 0.125x2

Combine like terms: 5.75x + -5.75x = 0.00
-71 + -4.75x + 0.125x2 = 0.00 + -0.125x2 + 0.125x2
-71 + -4.75x + 0.125x2 = -0.125x2 + 0.125x2

Combine like terms: -0.125x2 + 0.125x2 = 0.000
-71 + -4.75x + 0.125x2 = 0.000

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

Divide each side by '0.125'.
-568 + -38x + x2 = 0

Move the constant term to the right:

Add '568' to each side of the equation.
-568 + -38x + 568 + x2 = 0 + 568

Reorder the terms:
-568 + 568 + -38x + x2 = 0 + 568

Combine like terms: -568 + 568 = 0
0 + -38x + x2 = 0 + 568
-38x + x2 = 0 + 568

Combine like terms: 0 + 568 = 568
-38x + x2 = 568

The x term is -38x.  Take half its coefficient (-19).
Square it (361) and add it to both sides.

Add '361' to each side of the equation.
-38x + 361 + x2 = 568 + 361

Reorder the terms:
361 + -38x + x2 = 568 + 361

Combine like terms: 568 + 361 = 929
361 + -38x + x2 = 929

Factor a perfect square on the left side:
(x + -19)(x + -19) = 929

Calculate the square root of the right side: 30.479501308

Break this problem into two subproblems by setting 
(x + -19) equal to 30.479501308 and -30.479501308.

Subproblem 1

x + -19 = 30.479501308 Simplifying x + -19 = 30.479501308 Reorder the terms: -19 + x = 30.479501308 Solving -19 + x = 30.479501308 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '19' to each side of the equation. -19 + 19 + x = 30.479501308 + 19 Combine like terms: -19 + 19 = 0 0 + x = 30.479501308 + 19 x = 30.479501308 + 19 Combine like terms: 30.479501308 + 19 = 49.479501308 x = 49.479501308 Simplifying x = 49.479501308

Subproblem 2

x + -19 = -30.479501308 Simplifying x + -19 = -30.479501308 Reorder the terms: -19 + x = -30.479501308 Solving -19 + x = -30.479501308 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '19' to each side of the equation. -19 + 19 + x = -30.479501308 + 19 Combine like terms: -19 + 19 = 0 0 + x = -30.479501308 + 19 x = -30.479501308 + 19 Combine like terms: -30.479501308 + 19 = -11.479501308 x = -11.479501308 Simplifying x = -11.479501308

Solution

The solution to the problem is based on the solutions from the subproblems. x = {49.479501308, -11.479501308}

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