2z^2-7z-35=0

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Solution for 2z^2-7z-35=0 equation:


Simplifying
2z2 + -7z + -35 = 0

Reorder the terms:
-35 + -7z + 2z2 = 0

Solving
-35 + -7z + 2z2 = 0

Solving for variable 'z'.

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

Divide each side by '2'.
-17.5 + -3.5z + z2 = 0

Move the constant term to the right:

Add '17.5' to each side of the equation.
-17.5 + -3.5z + 17.5 + z2 = 0 + 17.5

Reorder the terms:
-17.5 + 17.5 + -3.5z + z2 = 0 + 17.5

Combine like terms: -17.5 + 17.5 = 0.0
0.0 + -3.5z + z2 = 0 + 17.5
-3.5z + z2 = 0 + 17.5

Combine like terms: 0 + 17.5 = 17.5
-3.5z + z2 = 17.5

The z term is -3.5z.  Take half its coefficient (-1.75).
Square it (3.0625) and add it to both sides.

Add '3.0625' to each side of the equation.
-3.5z + 3.0625 + z2 = 17.5 + 3.0625

Reorder the terms:
3.0625 + -3.5z + z2 = 17.5 + 3.0625

Combine like terms: 17.5 + 3.0625 = 20.5625
3.0625 + -3.5z + z2 = 20.5625

Factor a perfect square on the left side:
(z + -1.75)(z + -1.75) = 20.5625

Calculate the square root of the right side: 4.534589287

Break this problem into two subproblems by setting 
(z + -1.75) equal to 4.534589287 and -4.534589287.

Subproblem 1

z + -1.75 = 4.534589287 Simplifying z + -1.75 = 4.534589287 Reorder the terms: -1.75 + z = 4.534589287 Solving -1.75 + z = 4.534589287 Solving for variable 'z'. Move all terms containing z to the left, all other terms to the right. Add '1.75' to each side of the equation. -1.75 + 1.75 + z = 4.534589287 + 1.75 Combine like terms: -1.75 + 1.75 = 0.00 0.00 + z = 4.534589287 + 1.75 z = 4.534589287 + 1.75 Combine like terms: 4.534589287 + 1.75 = 6.284589287 z = 6.284589287 Simplifying z = 6.284589287

Subproblem 2

z + -1.75 = -4.534589287 Simplifying z + -1.75 = -4.534589287 Reorder the terms: -1.75 + z = -4.534589287 Solving -1.75 + z = -4.534589287 Solving for variable 'z'. Move all terms containing z to the left, all other terms to the right. Add '1.75' to each side of the equation. -1.75 + 1.75 + z = -4.534589287 + 1.75 Combine like terms: -1.75 + 1.75 = 0.00 0.00 + z = -4.534589287 + 1.75 z = -4.534589287 + 1.75 Combine like terms: -4.534589287 + 1.75 = -2.784589287 z = -2.784589287 Simplifying z = -2.784589287

Solution

The solution to the problem is based on the solutions from the subproblems. z = {6.284589287, -2.784589287}

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