z(z-5)=2

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Solution for z(z-5)=2 equation:


Simplifying
z(z + -5) = 2

Reorder the terms:
z(-5 + z) = 2
(-5 * z + z * z) = 2
(-5z + z2) = 2

Solving
-5z + z2 = 2

Solving for variable 'z'.

Reorder the terms:
-2 + -5z + z2 = 2 + -2

Combine like terms: 2 + -2 = 0
-2 + -5z + z2 = 0

Begin completing the square.

Move the constant term to the right:

Add '2' to each side of the equation.
-2 + -5z + 2 + z2 = 0 + 2

Reorder the terms:
-2 + 2 + -5z + z2 = 0 + 2

Combine like terms: -2 + 2 = 0
0 + -5z + z2 = 0 + 2
-5z + z2 = 0 + 2

Combine like terms: 0 + 2 = 2
-5z + z2 = 2

The z term is -5z.  Take half its coefficient (-2.5).
Square it (6.25) and add it to both sides.

Add '6.25' to each side of the equation.
-5z + 6.25 + z2 = 2 + 6.25

Reorder the terms:
6.25 + -5z + z2 = 2 + 6.25

Combine like terms: 2 + 6.25 = 8.25
6.25 + -5z + z2 = 8.25

Factor a perfect square on the left side:
(z + -2.5)(z + -2.5) = 8.25

Calculate the square root of the right side: 2.872281323

Break this problem into two subproblems by setting 
(z + -2.5) equal to 2.872281323 and -2.872281323.

Subproblem 1

z + -2.5 = 2.872281323 Simplifying z + -2.5 = 2.872281323 Reorder the terms: -2.5 + z = 2.872281323 Solving -2.5 + z = 2.872281323 Solving for variable 'z'. Move all terms containing z to the left, all other terms to the right. Add '2.5' to each side of the equation. -2.5 + 2.5 + z = 2.872281323 + 2.5 Combine like terms: -2.5 + 2.5 = 0.0 0.0 + z = 2.872281323 + 2.5 z = 2.872281323 + 2.5 Combine like terms: 2.872281323 + 2.5 = 5.372281323 z = 5.372281323 Simplifying z = 5.372281323

Subproblem 2

z + -2.5 = -2.872281323 Simplifying z + -2.5 = -2.872281323 Reorder the terms: -2.5 + z = -2.872281323 Solving -2.5 + z = -2.872281323 Solving for variable 'z'. Move all terms containing z to the left, all other terms to the right. Add '2.5' to each side of the equation. -2.5 + 2.5 + z = -2.872281323 + 2.5 Combine like terms: -2.5 + 2.5 = 0.0 0.0 + z = -2.872281323 + 2.5 z = -2.872281323 + 2.5 Combine like terms: -2.872281323 + 2.5 = -0.372281323 z = -0.372281323 Simplifying z = -0.372281323

Solution

The solution to the problem is based on the solutions from the subproblems. z = {5.372281323, -0.372281323}

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