k^2+17k=30

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Solution for k^2+17k=30 equation:


Simplifying
k2 + 17k = 30

Reorder the terms:
17k + k2 = 30

Solving
17k + k2 = 30

Solving for variable 'k'.

Reorder the terms:
-30 + 17k + k2 = 30 + -30

Combine like terms: 30 + -30 = 0
-30 + 17k + k2 = 0

Begin completing the square.

Move the constant term to the right:

Add '30' to each side of the equation.
-30 + 17k + 30 + k2 = 0 + 30

Reorder the terms:
-30 + 30 + 17k + k2 = 0 + 30

Combine like terms: -30 + 30 = 0
0 + 17k + k2 = 0 + 30
17k + k2 = 0 + 30

Combine like terms: 0 + 30 = 30
17k + k2 = 30

The k term is 17k.  Take half its coefficient (8.5).
Square it (72.25) and add it to both sides.

Add '72.25' to each side of the equation.
17k + 72.25 + k2 = 30 + 72.25

Reorder the terms:
72.25 + 17k + k2 = 30 + 72.25

Combine like terms: 30 + 72.25 = 102.25
72.25 + 17k + k2 = 102.25

Factor a perfect square on the left side:
(k + 8.5)(k + 8.5) = 102.25

Calculate the square root of the right side: 10.111874208

Break this problem into two subproblems by setting 
(k + 8.5) equal to 10.111874208 and -10.111874208.

Subproblem 1

k + 8.5 = 10.111874208 Simplifying k + 8.5 = 10.111874208 Reorder the terms: 8.5 + k = 10.111874208 Solving 8.5 + k = 10.111874208 Solving for variable 'k'. Move all terms containing k to the left, all other terms to the right. Add '-8.5' to each side of the equation. 8.5 + -8.5 + k = 10.111874208 + -8.5 Combine like terms: 8.5 + -8.5 = 0.0 0.0 + k = 10.111874208 + -8.5 k = 10.111874208 + -8.5 Combine like terms: 10.111874208 + -8.5 = 1.611874208 k = 1.611874208 Simplifying k = 1.611874208

Subproblem 2

k + 8.5 = -10.111874208 Simplifying k + 8.5 = -10.111874208 Reorder the terms: 8.5 + k = -10.111874208 Solving 8.5 + k = -10.111874208 Solving for variable 'k'. Move all terms containing k to the left, all other terms to the right. Add '-8.5' to each side of the equation. 8.5 + -8.5 + k = -10.111874208 + -8.5 Combine like terms: 8.5 + -8.5 = 0.0 0.0 + k = -10.111874208 + -8.5 k = -10.111874208 + -8.5 Combine like terms: -10.111874208 + -8.5 = -18.611874208 k = -18.611874208 Simplifying k = -18.611874208

Solution

The solution to the problem is based on the solutions from the subproblems. k = {1.611874208, -18.611874208}

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