k^2-20k-35=0

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Solution for k^2-20k-35=0 equation:


Simplifying
k2 + -20k + -35 = 0

Reorder the terms:
-35 + -20k + k2 = 0

Solving
-35 + -20k + k2 = 0

Solving for variable 'k'.

Begin completing the square.

Move the constant term to the right:

Add '35' to each side of the equation.
-35 + -20k + 35 + k2 = 0 + 35

Reorder the terms:
-35 + 35 + -20k + k2 = 0 + 35

Combine like terms: -35 + 35 = 0
0 + -20k + k2 = 0 + 35
-20k + k2 = 0 + 35

Combine like terms: 0 + 35 = 35
-20k + k2 = 35

The k term is -20k.  Take half its coefficient (-10).
Square it (100) and add it to both sides.

Add '100' to each side of the equation.
-20k + 100 + k2 = 35 + 100

Reorder the terms:
100 + -20k + k2 = 35 + 100

Combine like terms: 35 + 100 = 135
100 + -20k + k2 = 135

Factor a perfect square on the left side:
(k + -10)(k + -10) = 135

Calculate the square root of the right side: 11.618950039

Break this problem into two subproblems by setting 
(k + -10) equal to 11.618950039 and -11.618950039.

Subproblem 1

k + -10 = 11.618950039 Simplifying k + -10 = 11.618950039 Reorder the terms: -10 + k = 11.618950039 Solving -10 + k = 11.618950039 Solving for variable 'k'. Move all terms containing k to the left, all other terms to the right. Add '10' to each side of the equation. -10 + 10 + k = 11.618950039 + 10 Combine like terms: -10 + 10 = 0 0 + k = 11.618950039 + 10 k = 11.618950039 + 10 Combine like terms: 11.618950039 + 10 = 21.618950039 k = 21.618950039 Simplifying k = 21.618950039

Subproblem 2

k + -10 = -11.618950039 Simplifying k + -10 = -11.618950039 Reorder the terms: -10 + k = -11.618950039 Solving -10 + k = -11.618950039 Solving for variable 'k'. Move all terms containing k to the left, all other terms to the right. Add '10' to each side of the equation. -10 + 10 + k = -11.618950039 + 10 Combine like terms: -10 + 10 = 0 0 + k = -11.618950039 + 10 k = -11.618950039 + 10 Combine like terms: -11.618950039 + 10 = -1.618950039 k = -1.618950039 Simplifying k = -1.618950039

Solution

The solution to the problem is based on the solutions from the subproblems. k = {21.618950039, -1.618950039}

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