z^2-19z=56

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Solution for z^2-19z=56 equation:


Simplifying
z2 + -19z = 56

Reorder the terms:
-19z + z2 = 56

Solving
-19z + z2 = 56

Solving for variable 'z'.

Reorder the terms:
-56 + -19z + z2 = 56 + -56

Combine like terms: 56 + -56 = 0
-56 + -19z + z2 = 0

Begin completing the square.

Move the constant term to the right:

Add '56' to each side of the equation.
-56 + -19z + 56 + z2 = 0 + 56

Reorder the terms:
-56 + 56 + -19z + z2 = 0 + 56

Combine like terms: -56 + 56 = 0
0 + -19z + z2 = 0 + 56
-19z + z2 = 0 + 56

Combine like terms: 0 + 56 = 56
-19z + z2 = 56

The z term is -19z.  Take half its coefficient (-9.5).
Square it (90.25) and add it to both sides.

Add '90.25' to each side of the equation.
-19z + 90.25 + z2 = 56 + 90.25

Reorder the terms:
90.25 + -19z + z2 = 56 + 90.25

Combine like terms: 56 + 90.25 = 146.25
90.25 + -19z + z2 = 146.25

Factor a perfect square on the left side:
(z + -9.5)(z + -9.5) = 146.25

Calculate the square root of the right side: 12.093386622

Break this problem into two subproblems by setting 
(z + -9.5) equal to 12.093386622 and -12.093386622.

Subproblem 1

z + -9.5 = 12.093386622 Simplifying z + -9.5 = 12.093386622 Reorder the terms: -9.5 + z = 12.093386622 Solving -9.5 + z = 12.093386622 Solving for variable 'z'. Move all terms containing z to the left, all other terms to the right. Add '9.5' to each side of the equation. -9.5 + 9.5 + z = 12.093386622 + 9.5 Combine like terms: -9.5 + 9.5 = 0.0 0.0 + z = 12.093386622 + 9.5 z = 12.093386622 + 9.5 Combine like terms: 12.093386622 + 9.5 = 21.593386622 z = 21.593386622 Simplifying z = 21.593386622

Subproblem 2

z + -9.5 = -12.093386622 Simplifying z + -9.5 = -12.093386622 Reorder the terms: -9.5 + z = -12.093386622 Solving -9.5 + z = -12.093386622 Solving for variable 'z'. Move all terms containing z to the left, all other terms to the right. Add '9.5' to each side of the equation. -9.5 + 9.5 + z = -12.093386622 + 9.5 Combine like terms: -9.5 + 9.5 = 0.0 0.0 + z = -12.093386622 + 9.5 z = -12.093386622 + 9.5 Combine like terms: -12.093386622 + 9.5 = -2.593386622 z = -2.593386622 Simplifying z = -2.593386622

Solution

The solution to the problem is based on the solutions from the subproblems. z = {21.593386622, -2.593386622}

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