4k^2+40k=29

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Solution for 4k^2+40k=29 equation:


Simplifying
4k2 + 40k = 29

Reorder the terms:
40k + 4k2 = 29

Solving
40k + 4k2 = 29

Solving for variable 'k'.

Reorder the terms:
-29 + 40k + 4k2 = 29 + -29

Combine like terms: 29 + -29 = 0
-29 + 40k + 4k2 = 0

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

Divide each side by '4'.
-7.25 + 10k + k2 = 0

Move the constant term to the right:

Add '7.25' to each side of the equation.
-7.25 + 10k + 7.25 + k2 = 0 + 7.25

Reorder the terms:
-7.25 + 7.25 + 10k + k2 = 0 + 7.25

Combine like terms: -7.25 + 7.25 = 0.00
0.00 + 10k + k2 = 0 + 7.25
10k + k2 = 0 + 7.25

Combine like terms: 0 + 7.25 = 7.25
10k + k2 = 7.25

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 = 7.25 + 25

Reorder the terms:
25 + 10k + k2 = 7.25 + 25

Combine like terms: 7.25 + 25 = 32.25
25 + 10k + k2 = 32.25

Factor a perfect square on the left side:
(k + 5)(k + 5) = 32.25

Calculate the square root of the right side: 5.678908346

Break this problem into two subproblems by setting 
(k + 5) equal to 5.678908346 and -5.678908346.

Subproblem 1

k + 5 = 5.678908346 Simplifying k + 5 = 5.678908346 Reorder the terms: 5 + k = 5.678908346 Solving 5 + k = 5.678908346 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 = 5.678908346 + -5 Combine like terms: 5 + -5 = 0 0 + k = 5.678908346 + -5 k = 5.678908346 + -5 Combine like terms: 5.678908346 + -5 = 0.678908346 k = 0.678908346 Simplifying k = 0.678908346

Subproblem 2

k + 5 = -5.678908346 Simplifying k + 5 = -5.678908346 Reorder the terms: 5 + k = -5.678908346 Solving 5 + k = -5.678908346 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 = -5.678908346 + -5 Combine like terms: 5 + -5 = 0 0 + k = -5.678908346 + -5 k = -5.678908346 + -5 Combine like terms: -5.678908346 + -5 = -10.678908346 k = -10.678908346 Simplifying k = -10.678908346

Solution

The solution to the problem is based on the solutions from the subproblems. k = {0.678908346, -10.678908346}

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