z^2-3z-360=0

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Solution for z^2-3z-360=0 equation:


Simplifying
z2 + -3z + -360 = 0

Reorder the terms:
-360 + -3z + z2 = 0

Solving
-360 + -3z + z2 = 0

Solving for variable 'z'.

Begin completing the square.

Move the constant term to the right:

Add '360' to each side of the equation.
-360 + -3z + 360 + z2 = 0 + 360

Reorder the terms:
-360 + 360 + -3z + z2 = 0 + 360

Combine like terms: -360 + 360 = 0
0 + -3z + z2 = 0 + 360
-3z + z2 = 0 + 360

Combine like terms: 0 + 360 = 360
-3z + z2 = 360

The z term is -3z.  Take half its coefficient (-1.5).
Square it (2.25) and add it to both sides.

Add '2.25' to each side of the equation.
-3z + 2.25 + z2 = 360 + 2.25

Reorder the terms:
2.25 + -3z + z2 = 360 + 2.25

Combine like terms: 360 + 2.25 = 362.25
2.25 + -3z + z2 = 362.25

Factor a perfect square on the left side:
(z + -1.5)(z + -1.5) = 362.25

Calculate the square root of the right side: 19.032866311

Break this problem into two subproblems by setting 
(z + -1.5) equal to 19.032866311 and -19.032866311.

Subproblem 1

z + -1.5 = 19.032866311 Simplifying z + -1.5 = 19.032866311 Reorder the terms: -1.5 + z = 19.032866311 Solving -1.5 + z = 19.032866311 Solving for variable 'z'. Move all terms containing z to the left, all other terms to the right. Add '1.5' to each side of the equation. -1.5 + 1.5 + z = 19.032866311 + 1.5 Combine like terms: -1.5 + 1.5 = 0.0 0.0 + z = 19.032866311 + 1.5 z = 19.032866311 + 1.5 Combine like terms: 19.032866311 + 1.5 = 20.532866311 z = 20.532866311 Simplifying z = 20.532866311

Subproblem 2

z + -1.5 = -19.032866311 Simplifying z + -1.5 = -19.032866311 Reorder the terms: -1.5 + z = -19.032866311 Solving -1.5 + z = -19.032866311 Solving for variable 'z'. Move all terms containing z to the left, all other terms to the right. Add '1.5' to each side of the equation. -1.5 + 1.5 + z = -19.032866311 + 1.5 Combine like terms: -1.5 + 1.5 = 0.0 0.0 + z = -19.032866311 + 1.5 z = -19.032866311 + 1.5 Combine like terms: -19.032866311 + 1.5 = -17.532866311 z = -17.532866311 Simplifying z = -17.532866311

Solution

The solution to the problem is based on the solutions from the subproblems. z = {20.532866311, -17.532866311}

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