(z+5)(z-5)=z

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


Simplifying
(z + 5)(z + -5) = z

Reorder the terms:
(5 + z)(z + -5) = z

Reorder the terms:
(5 + z)(-5 + z) = z

Multiply (5 + z) * (-5 + z)
(5(-5 + z) + z(-5 + z)) = z
((-5 * 5 + z * 5) + z(-5 + z)) = z
((-25 + 5z) + z(-5 + z)) = z
(-25 + 5z + (-5 * z + z * z)) = z
(-25 + 5z + (-5z + z2)) = z

Combine like terms: 5z + -5z = 0
(-25 + 0 + z2) = z
(-25 + z2) = z

Solving
-25 + z2 = z

Solving for variable 'z'.

Reorder the terms:
-25 + -1z + z2 = z + -1z

Combine like terms: z + -1z = 0
-25 + -1z + z2 = 0

Begin completing the square.

Move the constant term to the right:

Add '25' to each side of the equation.
-25 + -1z + 25 + z2 = 0 + 25

Reorder the terms:
-25 + 25 + -1z + z2 = 0 + 25

Combine like terms: -25 + 25 = 0
0 + -1z + z2 = 0 + 25
-1z + z2 = 0 + 25

Combine like terms: 0 + 25 = 25
-1z + z2 = 25

The z term is -1z.  Take half its coefficient (-0.5).
Square it (0.25) and add it to both sides.

Add '0.25' to each side of the equation.
-1z + 0.25 + z2 = 25 + 0.25

Reorder the terms:
0.25 + -1z + z2 = 25 + 0.25

Combine like terms: 25 + 0.25 = 25.25
0.25 + -1z + z2 = 25.25

Factor a perfect square on the left side:
(z + -0.5)(z + -0.5) = 25.25

Calculate the square root of the right side: 5.024937811

Break this problem into two subproblems by setting 
(z + -0.5) equal to 5.024937811 and -5.024937811.

Subproblem 1

z + -0.5 = 5.024937811 Simplifying z + -0.5 = 5.024937811 Reorder the terms: -0.5 + z = 5.024937811 Solving -0.5 + z = 5.024937811 Solving for variable 'z'. Move all terms containing z to the left, all other terms to the right. Add '0.5' to each side of the equation. -0.5 + 0.5 + z = 5.024937811 + 0.5 Combine like terms: -0.5 + 0.5 = 0.0 0.0 + z = 5.024937811 + 0.5 z = 5.024937811 + 0.5 Combine like terms: 5.024937811 + 0.5 = 5.524937811 z = 5.524937811 Simplifying z = 5.524937811

Subproblem 2

z + -0.5 = -5.024937811 Simplifying z + -0.5 = -5.024937811 Reorder the terms: -0.5 + z = -5.024937811 Solving -0.5 + z = -5.024937811 Solving for variable 'z'. Move all terms containing z to the left, all other terms to the right. Add '0.5' to each side of the equation. -0.5 + 0.5 + z = -5.024937811 + 0.5 Combine like terms: -0.5 + 0.5 = 0.0 0.0 + z = -5.024937811 + 0.5 z = -5.024937811 + 0.5 Combine like terms: -5.024937811 + 0.5 = -4.524937811 z = -4.524937811 Simplifying z = -4.524937811

Solution

The solution to the problem is based on the solutions from the subproblems. z = {5.524937811, -4.524937811}

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