-x^2-38x+213=0

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Solution for -x^2-38x+213=0 equation:


Simplifying
-1x2 + -38x + 213 = 0

Reorder the terms:
213 + -38x + -1x2 = 0

Solving
213 + -38x + -1x2 = 0

Solving for variable 'x'.

Begin completing the square.  Divide all terms by
-1 the coefficient of the squared term: 

Divide each side by '-1'.
-213 + 38x + x2 = 0

Move the constant term to the right:

Add '213' to each side of the equation.
-213 + 38x + 213 + x2 = 0 + 213

Reorder the terms:
-213 + 213 + 38x + x2 = 0 + 213

Combine like terms: -213 + 213 = 0
0 + 38x + x2 = 0 + 213
38x + x2 = 0 + 213

Combine like terms: 0 + 213 = 213
38x + x2 = 213

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 = 213 + 361

Reorder the terms:
361 + 38x + x2 = 213 + 361

Combine like terms: 213 + 361 = 574
361 + 38x + x2 = 574

Factor a perfect square on the left side:
(x + 19)(x + 19) = 574

Calculate the square root of the right side: 23.958297101

Break this problem into two subproblems by setting 
(x + 19) equal to 23.958297101 and -23.958297101.

Subproblem 1

x + 19 = 23.958297101 Simplifying x + 19 = 23.958297101 Reorder the terms: 19 + x = 23.958297101 Solving 19 + x = 23.958297101 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 = 23.958297101 + -19 Combine like terms: 19 + -19 = 0 0 + x = 23.958297101 + -19 x = 23.958297101 + -19 Combine like terms: 23.958297101 + -19 = 4.958297101 x = 4.958297101 Simplifying x = 4.958297101

Subproblem 2

x + 19 = -23.958297101 Simplifying x + 19 = -23.958297101 Reorder the terms: 19 + x = -23.958297101 Solving 19 + x = -23.958297101 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 = -23.958297101 + -19 Combine like terms: 19 + -19 = 0 0 + x = -23.958297101 + -19 x = -23.958297101 + -19 Combine like terms: -23.958297101 + -19 = -42.958297101 x = -42.958297101 Simplifying x = -42.958297101

Solution

The solution to the problem is based on the solutions from the subproblems. x = {4.958297101, -42.958297101}

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