5z^2-17z=14

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Solution for 5z^2-17z=14 equation:


Simplifying
5z2 + -17z = 14

Reorder the terms:
-17z + 5z2 = 14

Solving
-17z + 5z2 = 14

Solving for variable 'z'.

Reorder the terms:
-14 + -17z + 5z2 = 14 + -14

Combine like terms: 14 + -14 = 0
-14 + -17z + 5z2 = 0

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

Divide each side by '5'.
-2.8 + -3.4z + z2 = 0

Move the constant term to the right:

Add '2.8' to each side of the equation.
-2.8 + -3.4z + 2.8 + z2 = 0 + 2.8

Reorder the terms:
-2.8 + 2.8 + -3.4z + z2 = 0 + 2.8

Combine like terms: -2.8 + 2.8 = 0.0
0.0 + -3.4z + z2 = 0 + 2.8
-3.4z + z2 = 0 + 2.8

Combine like terms: 0 + 2.8 = 2.8
-3.4z + z2 = 2.8

The z term is -3.4z.  Take half its coefficient (-1.7).
Square it (2.89) and add it to both sides.

Add '2.89' to each side of the equation.
-3.4z + 2.89 + z2 = 2.8 + 2.89

Reorder the terms:
2.89 + -3.4z + z2 = 2.8 + 2.89

Combine like terms: 2.8 + 2.89 = 5.69
2.89 + -3.4z + z2 = 5.69

Factor a perfect square on the left side:
(z + -1.7)(z + -1.7) = 5.69

Calculate the square root of the right side: 2.385372088

Break this problem into two subproblems by setting 
(z + -1.7) equal to 2.385372088 and -2.385372088.

Subproblem 1

z + -1.7 = 2.385372088 Simplifying z + -1.7 = 2.385372088 Reorder the terms: -1.7 + z = 2.385372088 Solving -1.7 + z = 2.385372088 Solving for variable 'z'. Move all terms containing z to the left, all other terms to the right. Add '1.7' to each side of the equation. -1.7 + 1.7 + z = 2.385372088 + 1.7 Combine like terms: -1.7 + 1.7 = 0.0 0.0 + z = 2.385372088 + 1.7 z = 2.385372088 + 1.7 Combine like terms: 2.385372088 + 1.7 = 4.085372088 z = 4.085372088 Simplifying z = 4.085372088

Subproblem 2

z + -1.7 = -2.385372088 Simplifying z + -1.7 = -2.385372088 Reorder the terms: -1.7 + z = -2.385372088 Solving -1.7 + z = -2.385372088 Solving for variable 'z'. Move all terms containing z to the left, all other terms to the right. Add '1.7' to each side of the equation. -1.7 + 1.7 + z = -2.385372088 + 1.7 Combine like terms: -1.7 + 1.7 = 0.0 0.0 + z = -2.385372088 + 1.7 z = -2.385372088 + 1.7 Combine like terms: -2.385372088 + 1.7 = -0.685372088 z = -0.685372088 Simplifying z = -0.685372088

Solution

The solution to the problem is based on the solutions from the subproblems. z = {4.085372088, -0.685372088}

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