-z^2-7z+34=0

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Solution for -z^2-7z+34=0 equation:


Simplifying
-1z2 + -7z + 34 = 0

Reorder the terms:
34 + -7z + -1z2 = 0

Solving
34 + -7z + -1z2 = 0

Solving for variable 'z'.

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

Divide each side by '-1'.
-34 + 7z + z2 = 0

Move the constant term to the right:

Add '34' to each side of the equation.
-34 + 7z + 34 + z2 = 0 + 34

Reorder the terms:
-34 + 34 + 7z + z2 = 0 + 34

Combine like terms: -34 + 34 = 0
0 + 7z + z2 = 0 + 34
7z + z2 = 0 + 34

Combine like terms: 0 + 34 = 34
7z + z2 = 34

The z term is 7z.  Take half its coefficient (3.5).
Square it (12.25) and add it to both sides.

Add '12.25' to each side of the equation.
7z + 12.25 + z2 = 34 + 12.25

Reorder the terms:
12.25 + 7z + z2 = 34 + 12.25

Combine like terms: 34 + 12.25 = 46.25
12.25 + 7z + z2 = 46.25

Factor a perfect square on the left side:
(z + 3.5)(z + 3.5) = 46.25

Calculate the square root of the right side: 6.800735254

Break this problem into two subproblems by setting 
(z + 3.5) equal to 6.800735254 and -6.800735254.

Subproblem 1

z + 3.5 = 6.800735254 Simplifying z + 3.5 = 6.800735254 Reorder the terms: 3.5 + z = 6.800735254 Solving 3.5 + z = 6.800735254 Solving for variable 'z'. Move all terms containing z to the left, all other terms to the right. Add '-3.5' to each side of the equation. 3.5 + -3.5 + z = 6.800735254 + -3.5 Combine like terms: 3.5 + -3.5 = 0.0 0.0 + z = 6.800735254 + -3.5 z = 6.800735254 + -3.5 Combine like terms: 6.800735254 + -3.5 = 3.300735254 z = 3.300735254 Simplifying z = 3.300735254

Subproblem 2

z + 3.5 = -6.800735254 Simplifying z + 3.5 = -6.800735254 Reorder the terms: 3.5 + z = -6.800735254 Solving 3.5 + z = -6.800735254 Solving for variable 'z'. Move all terms containing z to the left, all other terms to the right. Add '-3.5' to each side of the equation. 3.5 + -3.5 + z = -6.800735254 + -3.5 Combine like terms: 3.5 + -3.5 = 0.0 0.0 + z = -6.800735254 + -3.5 z = -6.800735254 + -3.5 Combine like terms: -6.800735254 + -3.5 = -10.300735254 z = -10.300735254 Simplifying z = -10.300735254

Solution

The solution to the problem is based on the solutions from the subproblems. z = {3.300735254, -10.300735254}

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