7k-8+k(k+12)=52

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Solution for 7k-8+k(k+12)=52 equation:


Simplifying
7k + -8 + k(k + 12) = 52

Reorder the terms:
7k + -8 + k(12 + k) = 52
7k + -8 + (12 * k + k * k) = 52
7k + -8 + (12k + k2) = 52

Reorder the terms:
-8 + 7k + 12k + k2 = 52

Combine like terms: 7k + 12k = 19k
-8 + 19k + k2 = 52

Solving
-8 + 19k + k2 = 52

Solving for variable 'k'.

Reorder the terms:
-8 + -52 + 19k + k2 = 52 + -52

Combine like terms: -8 + -52 = -60
-60 + 19k + k2 = 52 + -52

Combine like terms: 52 + -52 = 0
-60 + 19k + k2 = 0

Begin completing the square.

Move the constant term to the right:

Add '60' to each side of the equation.
-60 + 19k + 60 + k2 = 0 + 60

Reorder the terms:
-60 + 60 + 19k + k2 = 0 + 60

Combine like terms: -60 + 60 = 0
0 + 19k + k2 = 0 + 60
19k + k2 = 0 + 60

Combine like terms: 0 + 60 = 60
19k + k2 = 60

The k term is 19k.  Take half its coefficient (9.5).
Square it (90.25) and add it to both sides.

Add '90.25' to each side of the equation.
19k + 90.25 + k2 = 60 + 90.25

Reorder the terms:
90.25 + 19k + k2 = 60 + 90.25

Combine like terms: 60 + 90.25 = 150.25
90.25 + 19k + k2 = 150.25

Factor a perfect square on the left side:
(k + 9.5)(k + 9.5) = 150.25

Calculate the square root of the right side: 12.257650672

Break this problem into two subproblems by setting 
(k + 9.5) equal to 12.257650672 and -12.257650672.

Subproblem 1

k + 9.5 = 12.257650672 Simplifying k + 9.5 = 12.257650672 Reorder the terms: 9.5 + k = 12.257650672 Solving 9.5 + k = 12.257650672 Solving for variable 'k'. Move all terms containing k to the left, all other terms to the right. Add '-9.5' to each side of the equation. 9.5 + -9.5 + k = 12.257650672 + -9.5 Combine like terms: 9.5 + -9.5 = 0.0 0.0 + k = 12.257650672 + -9.5 k = 12.257650672 + -9.5 Combine like terms: 12.257650672 + -9.5 = 2.757650672 k = 2.757650672 Simplifying k = 2.757650672

Subproblem 2

k + 9.5 = -12.257650672 Simplifying k + 9.5 = -12.257650672 Reorder the terms: 9.5 + k = -12.257650672 Solving 9.5 + k = -12.257650672 Solving for variable 'k'. Move all terms containing k to the left, all other terms to the right. Add '-9.5' to each side of the equation. 9.5 + -9.5 + k = -12.257650672 + -9.5 Combine like terms: 9.5 + -9.5 = 0.0 0.0 + k = -12.257650672 + -9.5 k = -12.257650672 + -9.5 Combine like terms: -12.257650672 + -9.5 = -21.757650672 k = -21.757650672 Simplifying k = -21.757650672

Solution

The solution to the problem is based on the solutions from the subproblems. k = {2.757650672, -21.757650672}

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