(3z+1)(2z-50)=-5

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Solution for (3z+1)(2z-50)=-5 equation:


Simplifying
(3z + 1)(2z + -50) = -5

Reorder the terms:
(1 + 3z)(2z + -50) = -5

Reorder the terms:
(1 + 3z)(-50 + 2z) = -5

Multiply (1 + 3z) * (-50 + 2z)
(1(-50 + 2z) + 3z * (-50 + 2z)) = -5
((-50 * 1 + 2z * 1) + 3z * (-50 + 2z)) = -5
((-50 + 2z) + 3z * (-50 + 2z)) = -5
(-50 + 2z + (-50 * 3z + 2z * 3z)) = -5
(-50 + 2z + (-150z + 6z2)) = -5

Combine like terms: 2z + -150z = -148z
(-50 + -148z + 6z2) = -5

Solving
-50 + -148z + 6z2 = -5

Solving for variable 'z'.

Reorder the terms:
-50 + 5 + -148z + 6z2 = -5 + 5

Combine like terms: -50 + 5 = -45
-45 + -148z + 6z2 = -5 + 5

Combine like terms: -5 + 5 = 0
-45 + -148z + 6z2 = 0

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

Divide each side by '6'.
-7.5 + -24.66666667z + z2 = 0

Move the constant term to the right:

Add '7.5' to each side of the equation.
-7.5 + -24.66666667z + 7.5 + z2 = 0 + 7.5

Reorder the terms:
-7.5 + 7.5 + -24.66666667z + z2 = 0 + 7.5

Combine like terms: -7.5 + 7.5 = 0.0
0.0 + -24.66666667z + z2 = 0 + 7.5
-24.66666667z + z2 = 0 + 7.5

Combine like terms: 0 + 7.5 = 7.5
-24.66666667z + z2 = 7.5

The z term is -24.66666667z.  Take half its coefficient (-12.33333334).
Square it (152.1111113) and add it to both sides.

Add '152.1111113' to each side of the equation.
-24.66666667z + 152.1111113 + z2 = 7.5 + 152.1111113

Reorder the terms:
152.1111113 + -24.66666667z + z2 = 7.5 + 152.1111113

Combine like terms: 7.5 + 152.1111113 = 159.6111113
152.1111113 + -24.66666667z + z2 = 159.6111113

Factor a perfect square on the left side:
(z + -12.33333334)(z + -12.33333334) = 159.6111113

Calculate the square root of the right side: 12.633729113

Break this problem into two subproblems by setting 
(z + -12.33333334) equal to 12.633729113 and -12.633729113.

Subproblem 1

z + -12.33333334 = 12.633729113 Simplifying z + -12.33333334 = 12.633729113 Reorder the terms: -12.33333334 + z = 12.633729113 Solving -12.33333334 + z = 12.633729113 Solving for variable 'z'. Move all terms containing z to the left, all other terms to the right. Add '12.33333334' to each side of the equation. -12.33333334 + 12.33333334 + z = 12.633729113 + 12.33333334 Combine like terms: -12.33333334 + 12.33333334 = 0.00000000 0.00000000 + z = 12.633729113 + 12.33333334 z = 12.633729113 + 12.33333334 Combine like terms: 12.633729113 + 12.33333334 = 24.967062453 z = 24.967062453 Simplifying z = 24.967062453

Subproblem 2

z + -12.33333334 = -12.633729113 Simplifying z + -12.33333334 = -12.633729113 Reorder the terms: -12.33333334 + z = -12.633729113 Solving -12.33333334 + z = -12.633729113 Solving for variable 'z'. Move all terms containing z to the left, all other terms to the right. Add '12.33333334' to each side of the equation. -12.33333334 + 12.33333334 + z = -12.633729113 + 12.33333334 Combine like terms: -12.33333334 + 12.33333334 = 0.00000000 0.00000000 + z = -12.633729113 + 12.33333334 z = -12.633729113 + 12.33333334 Combine like terms: -12.633729113 + 12.33333334 = -0.300395773 z = -0.300395773 Simplifying z = -0.300395773

Solution

The solution to the problem is based on the solutions from the subproblems. z = {24.967062453, -0.300395773}

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