6z^2=2z^2+7z+5

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Solution for 6z^2=2z^2+7z+5 equation:


Simplifying
6z2 = 2z2 + 7z + 5

Reorder the terms:
6z2 = 5 + 7z + 2z2

Solving
6z2 = 5 + 7z + 2z2

Solving for variable 'z'.

Reorder the terms:
-5 + -7z + 6z2 + -2z2 = 5 + 7z + 2z2 + -5 + -7z + -2z2

Combine like terms: 6z2 + -2z2 = 4z2
-5 + -7z + 4z2 = 5 + 7z + 2z2 + -5 + -7z + -2z2

Reorder the terms:
-5 + -7z + 4z2 = 5 + -5 + 7z + -7z + 2z2 + -2z2

Combine like terms: 5 + -5 = 0
-5 + -7z + 4z2 = 0 + 7z + -7z + 2z2 + -2z2
-5 + -7z + 4z2 = 7z + -7z + 2z2 + -2z2

Combine like terms: 7z + -7z = 0
-5 + -7z + 4z2 = 0 + 2z2 + -2z2
-5 + -7z + 4z2 = 2z2 + -2z2

Combine like terms: 2z2 + -2z2 = 0
-5 + -7z + 4z2 = 0

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

Divide each side by '4'.
-1.25 + -1.75z + z2 = 0

Move the constant term to the right:

Add '1.25' to each side of the equation.
-1.25 + -1.75z + 1.25 + z2 = 0 + 1.25

Reorder the terms:
-1.25 + 1.25 + -1.75z + z2 = 0 + 1.25

Combine like terms: -1.25 + 1.25 = 0.00
0.00 + -1.75z + z2 = 0 + 1.25
-1.75z + z2 = 0 + 1.25

Combine like terms: 0 + 1.25 = 1.25
-1.75z + z2 = 1.25

The z term is -1.75z.  Take half its coefficient (-0.875).
Square it (0.765625) and add it to both sides.

Add '0.765625' to each side of the equation.
-1.75z + 0.765625 + z2 = 1.25 + 0.765625

Reorder the terms:
0.765625 + -1.75z + z2 = 1.25 + 0.765625

Combine like terms: 1.25 + 0.765625 = 2.015625
0.765625 + -1.75z + z2 = 2.015625

Factor a perfect square on the left side:
(z + -0.875)(z + -0.875) = 2.015625

Calculate the square root of the right side: 1.419727086

Break this problem into two subproblems by setting 
(z + -0.875) equal to 1.419727086 and -1.419727086.

Subproblem 1

z + -0.875 = 1.419727086 Simplifying z + -0.875 = 1.419727086 Reorder the terms: -0.875 + z = 1.419727086 Solving -0.875 + z = 1.419727086 Solving for variable 'z'. Move all terms containing z to the left, all other terms to the right. Add '0.875' to each side of the equation. -0.875 + 0.875 + z = 1.419727086 + 0.875 Combine like terms: -0.875 + 0.875 = 0.000 0.000 + z = 1.419727086 + 0.875 z = 1.419727086 + 0.875 Combine like terms: 1.419727086 + 0.875 = 2.294727086 z = 2.294727086 Simplifying z = 2.294727086

Subproblem 2

z + -0.875 = -1.419727086 Simplifying z + -0.875 = -1.419727086 Reorder the terms: -0.875 + z = -1.419727086 Solving -0.875 + z = -1.419727086 Solving for variable 'z'. Move all terms containing z to the left, all other terms to the right. Add '0.875' to each side of the equation. -0.875 + 0.875 + z = -1.419727086 + 0.875 Combine like terms: -0.875 + 0.875 = 0.000 0.000 + z = -1.419727086 + 0.875 z = -1.419727086 + 0.875 Combine like terms: -1.419727086 + 0.875 = -0.544727086 z = -0.544727086 Simplifying z = -0.544727086

Solution

The solution to the problem is based on the solutions from the subproblems. z = {2.294727086, -0.544727086}

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