0.5x^2+36x-168=390

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Solution for 0.5x^2+36x-168=390 equation:


Simplifying
0.5x2 + 36x + -168 = 390

Reorder the terms:
-168 + 36x + 0.5x2 = 390

Solving
-168 + 36x + 0.5x2 = 390

Solving for variable 'x'.

Reorder the terms:
-168 + -390 + 36x + 0.5x2 = 390 + -390

Combine like terms: -168 + -390 = -558
-558 + 36x + 0.5x2 = 390 + -390

Combine like terms: 390 + -390 = 0
-558 + 36x + 0.5x2 = 0

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

Divide each side by '0.5'.
-1116 + 72x + x2 = 0

Move the constant term to the right:

Add '1116' to each side of the equation.
-1116 + 72x + 1116 + x2 = 0 + 1116

Reorder the terms:
-1116 + 1116 + 72x + x2 = 0 + 1116

Combine like terms: -1116 + 1116 = 0
0 + 72x + x2 = 0 + 1116
72x + x2 = 0 + 1116

Combine like terms: 0 + 1116 = 1116
72x + x2 = 1116

The x term is 72x.  Take half its coefficient (36).
Square it (1296) and add it to both sides.

Add '1296' to each side of the equation.
72x + 1296 + x2 = 1116 + 1296

Reorder the terms:
1296 + 72x + x2 = 1116 + 1296

Combine like terms: 1116 + 1296 = 2412
1296 + 72x + x2 = 2412

Factor a perfect square on the left side:
(x + 36)(x + 36) = 2412

Calculate the square root of the right side: 49.112116631

Break this problem into two subproblems by setting 
(x + 36) equal to 49.112116631 and -49.112116631.

Subproblem 1

x + 36 = 49.112116631 Simplifying x + 36 = 49.112116631 Reorder the terms: 36 + x = 49.112116631 Solving 36 + x = 49.112116631 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-36' to each side of the equation. 36 + -36 + x = 49.112116631 + -36 Combine like terms: 36 + -36 = 0 0 + x = 49.112116631 + -36 x = 49.112116631 + -36 Combine like terms: 49.112116631 + -36 = 13.112116631 x = 13.112116631 Simplifying x = 13.112116631

Subproblem 2

x + 36 = -49.112116631 Simplifying x + 36 = -49.112116631 Reorder the terms: 36 + x = -49.112116631 Solving 36 + x = -49.112116631 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-36' to each side of the equation. 36 + -36 + x = -49.112116631 + -36 Combine like terms: 36 + -36 = 0 0 + x = -49.112116631 + -36 x = -49.112116631 + -36 Combine like terms: -49.112116631 + -36 = -85.112116631 x = -85.112116631 Simplifying x = -85.112116631

Solution

The solution to the problem is based on the solutions from the subproblems. x = {13.112116631, -85.112116631}

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