-k^2+10k+25=-5

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Solution for -k^2+10k+25=-5 equation:


Simplifying
-1k2 + 10k + 25 = -5

Reorder the terms:
25 + 10k + -1k2 = -5

Solving
25 + 10k + -1k2 = -5

Solving for variable 'k'.

Reorder the terms:
25 + 5 + 10k + -1k2 = -5 + 5

Combine like terms: 25 + 5 = 30
30 + 10k + -1k2 = -5 + 5

Combine like terms: -5 + 5 = 0
30 + 10k + -1k2 = 0

Begin completing the square.  Divide all terms by
-1 the coefficient of the squared term: 

Divide each side by '-1'.
-30 + -10k + k2 = 0

Move the constant term to the right:

Add '30' to each side of the equation.
-30 + -10k + 30 + k2 = 0 + 30

Reorder the terms:
-30 + 30 + -10k + k2 = 0 + 30

Combine like terms: -30 + 30 = 0
0 + -10k + k2 = 0 + 30
-10k + k2 = 0 + 30

Combine like terms: 0 + 30 = 30
-10k + k2 = 30

The k term is -10k.  Take half its coefficient (-5).
Square it (25) and add it to both sides.

Add '25' to each side of the equation.
-10k + 25 + k2 = 30 + 25

Reorder the terms:
25 + -10k + k2 = 30 + 25

Combine like terms: 30 + 25 = 55
25 + -10k + k2 = 55

Factor a perfect square on the left side:
(k + -5)(k + -5) = 55

Calculate the square root of the right side: 7.416198487

Break this problem into two subproblems by setting 
(k + -5) equal to 7.416198487 and -7.416198487.

Subproblem 1

k + -5 = 7.416198487 Simplifying k + -5 = 7.416198487 Reorder the terms: -5 + k = 7.416198487 Solving -5 + k = 7.416198487 Solving for variable 'k'. Move all terms containing k to the left, all other terms to the right. Add '5' to each side of the equation. -5 + 5 + k = 7.416198487 + 5 Combine like terms: -5 + 5 = 0 0 + k = 7.416198487 + 5 k = 7.416198487 + 5 Combine like terms: 7.416198487 + 5 = 12.416198487 k = 12.416198487 Simplifying k = 12.416198487

Subproblem 2

k + -5 = -7.416198487 Simplifying k + -5 = -7.416198487 Reorder the terms: -5 + k = -7.416198487 Solving -5 + k = -7.416198487 Solving for variable 'k'. Move all terms containing k to the left, all other terms to the right. Add '5' to each side of the equation. -5 + 5 + k = -7.416198487 + 5 Combine like terms: -5 + 5 = 0 0 + k = -7.416198487 + 5 k = -7.416198487 + 5 Combine like terms: -7.416198487 + 5 = -2.416198487 k = -2.416198487 Simplifying k = -2.416198487

Solution

The solution to the problem is based on the solutions from the subproblems. k = {12.416198487, -2.416198487}

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