x^2+156x+355=0

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Solution for x^2+156x+355=0 equation:


Simplifying
x2 + 156x + 355 = 0

Reorder the terms:
355 + 156x + x2 = 0

Solving
355 + 156x + x2 = 0

Solving for variable 'x'.

Begin completing the square.

Move the constant term to the right:

Add '-355' to each side of the equation.
355 + 156x + -355 + x2 = 0 + -355

Reorder the terms:
355 + -355 + 156x + x2 = 0 + -355

Combine like terms: 355 + -355 = 0
0 + 156x + x2 = 0 + -355
156x + x2 = 0 + -355

Combine like terms: 0 + -355 = -355
156x + x2 = -355

The x term is 156x.  Take half its coefficient (78).
Square it (6084) and add it to both sides.

Add '6084' to each side of the equation.
156x + 6084 + x2 = -355 + 6084

Reorder the terms:
6084 + 156x + x2 = -355 + 6084

Combine like terms: -355 + 6084 = 5729
6084 + 156x + x2 = 5729

Factor a perfect square on the left side:
(x + 78)(x + 78) = 5729

Calculate the square root of the right side: 75.690157881

Break this problem into two subproblems by setting 
(x + 78) equal to 75.690157881 and -75.690157881.

Subproblem 1

x + 78 = 75.690157881 Simplifying x + 78 = 75.690157881 Reorder the terms: 78 + x = 75.690157881 Solving 78 + x = 75.690157881 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-78' to each side of the equation. 78 + -78 + x = 75.690157881 + -78 Combine like terms: 78 + -78 = 0 0 + x = 75.690157881 + -78 x = 75.690157881 + -78 Combine like terms: 75.690157881 + -78 = -2.309842119 x = -2.309842119 Simplifying x = -2.309842119

Subproblem 2

x + 78 = -75.690157881 Simplifying x + 78 = -75.690157881 Reorder the terms: 78 + x = -75.690157881 Solving 78 + x = -75.690157881 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-78' to each side of the equation. 78 + -78 + x = -75.690157881 + -78 Combine like terms: 78 + -78 = 0 0 + x = -75.690157881 + -78 x = -75.690157881 + -78 Combine like terms: -75.690157881 + -78 = -153.690157881 x = -153.690157881 Simplifying x = -153.690157881

Solution

The solution to the problem is based on the solutions from the subproblems. x = {-2.309842119, -153.690157881}

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