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

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


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

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

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

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

Combine like terms: 3z + -2z = 1z
(-2 + 1z + 3z2) = 2 + 5

Combine like terms: 2 + 5 = 7
-2 + 1z + 3z2 = 7

Solving
-2 + 1z + 3z2 = 7

Solving for variable 'z'.

Reorder the terms:
-2 + -7 + 1z + 3z2 = 7 + -7

Combine like terms: -2 + -7 = -9
-9 + 1z + 3z2 = 7 + -7

Combine like terms: 7 + -7 = 0
-9 + 1z + 3z2 = 0

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

Divide each side by '3'.
-3 + 0.3333333333z + z2 = 0

Move the constant term to the right:

Add '3' to each side of the equation.
-3 + 0.3333333333z + 3 + z2 = 0 + 3

Reorder the terms:
-3 + 3 + 0.3333333333z + z2 = 0 + 3

Combine like terms: -3 + 3 = 0
0 + 0.3333333333z + z2 = 0 + 3
0.3333333333z + z2 = 0 + 3

Combine like terms: 0 + 3 = 3
0.3333333333z + z2 = 3

The z term is 0.3333333333z.  Take half its coefficient (0.1666666667).
Square it (0.02777777779) and add it to both sides.

Add '0.02777777779' to each side of the equation.
0.3333333333z + 0.02777777779 + z2 = 3 + 0.02777777779

Reorder the terms:
0.02777777779 + 0.3333333333z + z2 = 3 + 0.02777777779

Combine like terms: 3 + 0.02777777779 = 3.02777777779
0.02777777779 + 0.3333333333z + z2 = 3.02777777779

Factor a perfect square on the left side:
(z + 0.1666666667)(z + 0.1666666667) = 3.02777777779

Calculate the square root of the right side: 1.740051085

Break this problem into two subproblems by setting 
(z + 0.1666666667) equal to 1.740051085 and -1.740051085.

Subproblem 1

z + 0.1666666667 = 1.740051085 Simplifying z + 0.1666666667 = 1.740051085 Reorder the terms: 0.1666666667 + z = 1.740051085 Solving 0.1666666667 + z = 1.740051085 Solving for variable 'z'. Move all terms containing z to the left, all other terms to the right. Add '-0.1666666667' to each side of the equation. 0.1666666667 + -0.1666666667 + z = 1.740051085 + -0.1666666667 Combine like terms: 0.1666666667 + -0.1666666667 = 0.0000000000 0.0000000000 + z = 1.740051085 + -0.1666666667 z = 1.740051085 + -0.1666666667 Combine like terms: 1.740051085 + -0.1666666667 = 1.5733844183 z = 1.5733844183 Simplifying z = 1.5733844183

Subproblem 2

z + 0.1666666667 = -1.740051085 Simplifying z + 0.1666666667 = -1.740051085 Reorder the terms: 0.1666666667 + z = -1.740051085 Solving 0.1666666667 + z = -1.740051085 Solving for variable 'z'. Move all terms containing z to the left, all other terms to the right. Add '-0.1666666667' to each side of the equation. 0.1666666667 + -0.1666666667 + z = -1.740051085 + -0.1666666667 Combine like terms: 0.1666666667 + -0.1666666667 = 0.0000000000 0.0000000000 + z = -1.740051085 + -0.1666666667 z = -1.740051085 + -0.1666666667 Combine like terms: -1.740051085 + -0.1666666667 = -1.9067177517 z = -1.9067177517 Simplifying z = -1.9067177517

Solution

The solution to the problem is based on the solutions from the subproblems. z = {1.5733844183, -1.9067177517}

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