0=x^2+155x-360

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Solution for 0=x^2+155x-360 equation:


Simplifying
0 = x2 + 155x + -360

Reorder the terms:
0 = -360 + 155x + x2

Solving
0 = -360 + 155x + x2

Solving for variable 'x'.

Combine like terms: 0 + 360 = 360
360 + -155x + -1x2 = -360 + 155x + x2 + 360 + -155x + -1x2

Reorder the terms:
360 + -155x + -1x2 = -360 + 360 + 155x + -155x + x2 + -1x2

Combine like terms: -360 + 360 = 0
360 + -155x + -1x2 = 0 + 155x + -155x + x2 + -1x2
360 + -155x + -1x2 = 155x + -155x + x2 + -1x2

Combine like terms: 155x + -155x = 0
360 + -155x + -1x2 = 0 + x2 + -1x2
360 + -155x + -1x2 = x2 + -1x2

Combine like terms: x2 + -1x2 = 0
360 + -155x + -1x2 = 0

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

Divide each side by '-1'.
-360 + 155x + x2 = 0

Move the constant term to the right:

Add '360' to each side of the equation.
-360 + 155x + 360 + x2 = 0 + 360

Reorder the terms:
-360 + 360 + 155x + x2 = 0 + 360

Combine like terms: -360 + 360 = 0
0 + 155x + x2 = 0 + 360
155x + x2 = 0 + 360

Combine like terms: 0 + 360 = 360
155x + x2 = 360

The x term is 155x.  Take half its coefficient (77.5).
Square it (6006.25) and add it to both sides.

Add '6006.25' to each side of the equation.
155x + 6006.25 + x2 = 360 + 6006.25

Reorder the terms:
6006.25 + 155x + x2 = 360 + 6006.25

Combine like terms: 360 + 6006.25 = 6366.25
6006.25 + 155x + x2 = 6366.25

Factor a perfect square on the left side:
(x + 77.5)(x + 77.5) = 6366.25

Calculate the square root of the right side: 79.788783673

Break this problem into two subproblems by setting 
(x + 77.5) equal to 79.788783673 and -79.788783673.

Subproblem 1

x + 77.5 = 79.788783673 Simplifying x + 77.5 = 79.788783673 Reorder the terms: 77.5 + x = 79.788783673 Solving 77.5 + x = 79.788783673 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-77.5' to each side of the equation. 77.5 + -77.5 + x = 79.788783673 + -77.5 Combine like terms: 77.5 + -77.5 = 0.0 0.0 + x = 79.788783673 + -77.5 x = 79.788783673 + -77.5 Combine like terms: 79.788783673 + -77.5 = 2.288783673 x = 2.288783673 Simplifying x = 2.288783673

Subproblem 2

x + 77.5 = -79.788783673 Simplifying x + 77.5 = -79.788783673 Reorder the terms: 77.5 + x = -79.788783673 Solving 77.5 + x = -79.788783673 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-77.5' to each side of the equation. 77.5 + -77.5 + x = -79.788783673 + -77.5 Combine like terms: 77.5 + -77.5 = 0.0 0.0 + x = -79.788783673 + -77.5 x = -79.788783673 + -77.5 Combine like terms: -79.788783673 + -77.5 = -157.288783673 x = -157.288783673 Simplifying x = -157.288783673

Solution

The solution to the problem is based on the solutions from the subproblems. x = {2.288783673, -157.288783673}

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