500+-9x=4x^2

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Solution for 500+-9x=4x^2 equation:


Simplifying
500 + -9x = 4x2

Solving
500 + -9x = 4x2

Solving for variable 'x'.

Combine like terms: 4x2 + -4x2 = 0
500 + -9x + -4x2 = 0

Begin completing the square.  Divide all terms by
-4 the coefficient of the squared term: 

Divide each side by '-4'.
-125 + 2.25x + x2 = 0

Move the constant term to the right:

Add '125' to each side of the equation.
-125 + 2.25x + 125 + x2 = 0 + 125

Reorder the terms:
-125 + 125 + 2.25x + x2 = 0 + 125

Combine like terms: -125 + 125 = 0
0 + 2.25x + x2 = 0 + 125
2.25x + x2 = 0 + 125

Combine like terms: 0 + 125 = 125
2.25x + x2 = 125

The x term is 2.25x.  Take half its coefficient (1.125).
Square it (1.265625) and add it to both sides.

Add '1.265625' to each side of the equation.
2.25x + 1.265625 + x2 = 125 + 1.265625

Reorder the terms:
1.265625 + 2.25x + x2 = 125 + 1.265625

Combine like terms: 125 + 1.265625 = 126.265625
1.265625 + 2.25x + x2 = 126.265625

Factor a perfect square on the left side:
(x + 1.125)(x + 1.125) = 126.265625

Calculate the square root of the right side: 11.236797809

Break this problem into two subproblems by setting 
(x + 1.125) equal to 11.236797809 and -11.236797809.

Subproblem 1

x + 1.125 = 11.236797809 Simplifying x + 1.125 = 11.236797809 Reorder the terms: 1.125 + x = 11.236797809 Solving 1.125 + x = 11.236797809 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-1.125' to each side of the equation. 1.125 + -1.125 + x = 11.236797809 + -1.125 Combine like terms: 1.125 + -1.125 = 0.000 0.000 + x = 11.236797809 + -1.125 x = 11.236797809 + -1.125 Combine like terms: 11.236797809 + -1.125 = 10.111797809 x = 10.111797809 Simplifying x = 10.111797809

Subproblem 2

x + 1.125 = -11.236797809 Simplifying x + 1.125 = -11.236797809 Reorder the terms: 1.125 + x = -11.236797809 Solving 1.125 + x = -11.236797809 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-1.125' to each side of the equation. 1.125 + -1.125 + x = -11.236797809 + -1.125 Combine like terms: 1.125 + -1.125 = 0.000 0.000 + x = -11.236797809 + -1.125 x = -11.236797809 + -1.125 Combine like terms: -11.236797809 + -1.125 = -12.361797809 x = -12.361797809 Simplifying x = -12.361797809

Solution

The solution to the problem is based on the solutions from the subproblems. x = {10.111797809, -12.361797809}

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