(5x+2x*x)=500

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Solution for (5x+2x*x)=500 equation:


Simplifying
(5x + 2x * x) = 500

Multiply x * x
(5x + 2x2) = 500

Remove parenthesis around (5x + 2x2)
5x + 2x2 = 500

Solving
5x + 2x2 = 500

Solving for variable 'x'.

Reorder the terms:
-500 + 5x + 2x2 = 500 + -500

Combine like terms: 500 + -500 = 0
-500 + 5x + 2x2 = 0

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

Divide each side by '2'.
-250 + 2.5x + x2 = 0

Move the constant term to the right:

Add '250' to each side of the equation.
-250 + 2.5x + 250 + x2 = 0 + 250

Reorder the terms:
-250 + 250 + 2.5x + x2 = 0 + 250

Combine like terms: -250 + 250 = 0
0 + 2.5x + x2 = 0 + 250
2.5x + x2 = 0 + 250

Combine like terms: 0 + 250 = 250
2.5x + x2 = 250

The x term is 2.5x.  Take half its coefficient (1.25).
Square it (1.5625) and add it to both sides.

Add '1.5625' to each side of the equation.
2.5x + 1.5625 + x2 = 250 + 1.5625

Reorder the terms:
1.5625 + 2.5x + x2 = 250 + 1.5625

Combine like terms: 250 + 1.5625 = 251.5625
1.5625 + 2.5x + x2 = 251.5625

Factor a perfect square on the left side:
(x + 1.25)(x + 1.25) = 251.5625

Calculate the square root of the right side: 15.860721926

Break this problem into two subproblems by setting 
(x + 1.25) equal to 15.860721926 and -15.860721926.

Subproblem 1

x + 1.25 = 15.860721926 Simplifying x + 1.25 = 15.860721926 Reorder the terms: 1.25 + x = 15.860721926 Solving 1.25 + x = 15.860721926 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-1.25' to each side of the equation. 1.25 + -1.25 + x = 15.860721926 + -1.25 Combine like terms: 1.25 + -1.25 = 0.00 0.00 + x = 15.860721926 + -1.25 x = 15.860721926 + -1.25 Combine like terms: 15.860721926 + -1.25 = 14.610721926 x = 14.610721926 Simplifying x = 14.610721926

Subproblem 2

x + 1.25 = -15.860721926 Simplifying x + 1.25 = -15.860721926 Reorder the terms: 1.25 + x = -15.860721926 Solving 1.25 + x = -15.860721926 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-1.25' to each side of the equation. 1.25 + -1.25 + x = -15.860721926 + -1.25 Combine like terms: 1.25 + -1.25 = 0.00 0.00 + x = -15.860721926 + -1.25 x = -15.860721926 + -1.25 Combine like terms: -15.860721926 + -1.25 = -17.110721926 x = -17.110721926 Simplifying x = -17.110721926

Solution

The solution to the problem is based on the solutions from the subproblems. x = {14.610721926, -17.110721926}

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