(2)(0.5Z*0.5+7)=(Z)(Z-5)

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Solution for (2)(0.5Z*0.5+7)=(Z)(Z-5) equation:


Simplifying
(2)(0.5Z * 0.5 + 7) = (Z)(Z + -5)

Reorder the terms for easier multiplication:
2(0.5 * 0.5Z + 7) = (Z)(Z + -5)

Multiply 0.5 * 0.5
2(0.25Z + 7) = (Z)(Z + -5)

Reorder the terms:
2(7 + 0.25Z) = (Z)(Z + -5)
(7 * 2 + 0.25Z * 2) = (Z)(Z + -5)
(14 + 0.5Z) = (Z)(Z + -5)

Reorder the terms:
14 + 0.5Z = Z(-5 + Z)
14 + 0.5Z = (-5 * Z + Z * Z)
14 + 0.5Z = (-5Z + Z2)

Solving
14 + 0.5Z = -5Z + Z2

Solving for variable 'Z'.

Combine like terms: 0.5Z + 5Z = 5.5Z
14 + 5.5Z + -1Z2 = -5Z + Z2 + 5Z + -1Z2

Reorder the terms:
14 + 5.5Z + -1Z2 = -5Z + 5Z + Z2 + -1Z2

Combine like terms: -5Z + 5Z = 0
14 + 5.5Z + -1Z2 = 0 + Z2 + -1Z2
14 + 5.5Z + -1Z2 = Z2 + -1Z2

Combine like terms: Z2 + -1Z2 = 0
14 + 5.5Z + -1Z2 = 0

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

Divide each side by '-1'.
-14 + -5.5Z + Z2 = 0

Move the constant term to the right:

Add '14' to each side of the equation.
-14 + -5.5Z + 14 + Z2 = 0 + 14

Reorder the terms:
-14 + 14 + -5.5Z + Z2 = 0 + 14

Combine like terms: -14 + 14 = 0
0 + -5.5Z + Z2 = 0 + 14
-5.5Z + Z2 = 0 + 14

Combine like terms: 0 + 14 = 14
-5.5Z + Z2 = 14

The Z term is -5.5Z.  Take half its coefficient (-2.75).
Square it (7.5625) and add it to both sides.

Add '7.5625' to each side of the equation.
-5.5Z + 7.5625 + Z2 = 14 + 7.5625

Reorder the terms:
7.5625 + -5.5Z + Z2 = 14 + 7.5625

Combine like terms: 14 + 7.5625 = 21.5625
7.5625 + -5.5Z + Z2 = 21.5625

Factor a perfect square on the left side:
(Z + -2.75)(Z + -2.75) = 21.5625

Calculate the square root of the right side: 4.643543905

Break this problem into two subproblems by setting 
(Z + -2.75) equal to 4.643543905 and -4.643543905.

Subproblem 1

Z + -2.75 = 4.643543905 Simplifying Z + -2.75 = 4.643543905 Reorder the terms: -2.75 + Z = 4.643543905 Solving -2.75 + Z = 4.643543905 Solving for variable 'Z'. Move all terms containing Z to the left, all other terms to the right. Add '2.75' to each side of the equation. -2.75 + 2.75 + Z = 4.643543905 + 2.75 Combine like terms: -2.75 + 2.75 = 0.00 0.00 + Z = 4.643543905 + 2.75 Z = 4.643543905 + 2.75 Combine like terms: 4.643543905 + 2.75 = 7.393543905 Z = 7.393543905 Simplifying Z = 7.393543905

Subproblem 2

Z + -2.75 = -4.643543905 Simplifying Z + -2.75 = -4.643543905 Reorder the terms: -2.75 + Z = -4.643543905 Solving -2.75 + Z = -4.643543905 Solving for variable 'Z'. Move all terms containing Z to the left, all other terms to the right. Add '2.75' to each side of the equation. -2.75 + 2.75 + Z = -4.643543905 + 2.75 Combine like terms: -2.75 + 2.75 = 0.00 0.00 + Z = -4.643543905 + 2.75 Z = -4.643543905 + 2.75 Combine like terms: -4.643543905 + 2.75 = -1.893543905 Z = -1.893543905 Simplifying Z = -1.893543905

Solution

The solution to the problem is based on the solutions from the subproblems. Z = {7.393543905, -1.893543905}

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