z^2-4z-35=0

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Solution for z^2-4z-35=0 equation:


Simplifying
z2 + -4z + -35 = 0

Reorder the terms:
-35 + -4z + z2 = 0

Solving
-35 + -4z + z2 = 0

Solving for variable 'z'.

Begin completing the square.

Move the constant term to the right:

Add '35' to each side of the equation.
-35 + -4z + 35 + z2 = 0 + 35

Reorder the terms:
-35 + 35 + -4z + z2 = 0 + 35

Combine like terms: -35 + 35 = 0
0 + -4z + z2 = 0 + 35
-4z + z2 = 0 + 35

Combine like terms: 0 + 35 = 35
-4z + z2 = 35

The z term is -4z.  Take half its coefficient (-2).
Square it (4) and add it to both sides.

Add '4' to each side of the equation.
-4z + 4 + z2 = 35 + 4

Reorder the terms:
4 + -4z + z2 = 35 + 4

Combine like terms: 35 + 4 = 39
4 + -4z + z2 = 39

Factor a perfect square on the left side:
(z + -2)(z + -2) = 39

Calculate the square root of the right side: 6.244997998

Break this problem into two subproblems by setting 
(z + -2) equal to 6.244997998 and -6.244997998.

Subproblem 1

z + -2 = 6.244997998 Simplifying z + -2 = 6.244997998 Reorder the terms: -2 + z = 6.244997998 Solving -2 + z = 6.244997998 Solving for variable 'z'. Move all terms containing z to the left, all other terms to the right. Add '2' to each side of the equation. -2 + 2 + z = 6.244997998 + 2 Combine like terms: -2 + 2 = 0 0 + z = 6.244997998 + 2 z = 6.244997998 + 2 Combine like terms: 6.244997998 + 2 = 8.244997998 z = 8.244997998 Simplifying z = 8.244997998

Subproblem 2

z + -2 = -6.244997998 Simplifying z + -2 = -6.244997998 Reorder the terms: -2 + z = -6.244997998 Solving -2 + z = -6.244997998 Solving for variable 'z'. Move all terms containing z to the left, all other terms to the right. Add '2' to each side of the equation. -2 + 2 + z = -6.244997998 + 2 Combine like terms: -2 + 2 = 0 0 + z = -6.244997998 + 2 z = -6.244997998 + 2 Combine like terms: -6.244997998 + 2 = -4.244997998 z = -4.244997998 Simplifying z = -4.244997998

Solution

The solution to the problem is based on the solutions from the subproblems. z = {8.244997998, -4.244997998}

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