k^2+11k=30

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Solution for k^2+11k=30 equation:


Simplifying
k2 + 11k = 30

Reorder the terms:
11k + k2 = 30

Solving
11k + k2 = 30

Solving for variable 'k'.

Reorder the terms:
-30 + 11k + k2 = 30 + -30

Combine like terms: 30 + -30 = 0
-30 + 11k + k2 = 0

Begin completing the square.

Move the constant term to the right:

Add '30' to each side of the equation.
-30 + 11k + 30 + k2 = 0 + 30

Reorder the terms:
-30 + 30 + 11k + k2 = 0 + 30

Combine like terms: -30 + 30 = 0
0 + 11k + k2 = 0 + 30
11k + k2 = 0 + 30

Combine like terms: 0 + 30 = 30
11k + k2 = 30

The k term is 11k.  Take half its coefficient (5.5).
Square it (30.25) and add it to both sides.

Add '30.25' to each side of the equation.
11k + 30.25 + k2 = 30 + 30.25

Reorder the terms:
30.25 + 11k + k2 = 30 + 30.25

Combine like terms: 30 + 30.25 = 60.25
30.25 + 11k + k2 = 60.25

Factor a perfect square on the left side:
(k + 5.5)(k + 5.5) = 60.25

Calculate the square root of the right side: 7.762087348

Break this problem into two subproblems by setting 
(k + 5.5) equal to 7.762087348 and -7.762087348.

Subproblem 1

k + 5.5 = 7.762087348 Simplifying k + 5.5 = 7.762087348 Reorder the terms: 5.5 + k = 7.762087348 Solving 5.5 + k = 7.762087348 Solving for variable 'k'. Move all terms containing k to the left, all other terms to the right. Add '-5.5' to each side of the equation. 5.5 + -5.5 + k = 7.762087348 + -5.5 Combine like terms: 5.5 + -5.5 = 0.0 0.0 + k = 7.762087348 + -5.5 k = 7.762087348 + -5.5 Combine like terms: 7.762087348 + -5.5 = 2.262087348 k = 2.262087348 Simplifying k = 2.262087348

Subproblem 2

k + 5.5 = -7.762087348 Simplifying k + 5.5 = -7.762087348 Reorder the terms: 5.5 + k = -7.762087348 Solving 5.5 + k = -7.762087348 Solving for variable 'k'. Move all terms containing k to the left, all other terms to the right. Add '-5.5' to each side of the equation. 5.5 + -5.5 + k = -7.762087348 + -5.5 Combine like terms: 5.5 + -5.5 = 0.0 0.0 + k = -7.762087348 + -5.5 k = -7.762087348 + -5.5 Combine like terms: -7.762087348 + -5.5 = -13.262087348 k = -13.262087348 Simplifying k = -13.262087348

Solution

The solution to the problem is based on the solutions from the subproblems. k = {2.262087348, -13.262087348}

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