-3k(k+3)-(5+5k)=-9

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Solution for -3k(k+3)-(5+5k)=-9 equation:


Simplifying
-3k(k + 3) + -1(5 + 5k) = -9

Reorder the terms:
-3k(3 + k) + -1(5 + 5k) = -9
(3 * -3k + k * -3k) + -1(5 + 5k) = -9
(-9k + -3k2) + -1(5 + 5k) = -9
-9k + -3k2 + (5 * -1 + 5k * -1) = -9
-9k + -3k2 + (-5 + -5k) = -9

Reorder the terms:
-5 + -9k + -5k + -3k2 = -9

Combine like terms: -9k + -5k = -14k
-5 + -14k + -3k2 = -9

Solving
-5 + -14k + -3k2 = -9

Solving for variable 'k'.

Reorder the terms:
-5 + 9 + -14k + -3k2 = -9 + 9

Combine like terms: -5 + 9 = 4
4 + -14k + -3k2 = -9 + 9

Combine like terms: -9 + 9 = 0
4 + -14k + -3k2 = 0

Begin completing the square.  Divide all terms by
-3 the coefficient of the squared term: 

Divide each side by '-3'.
-1.333333333 + 4.666666667k + k2 = 0

Move the constant term to the right:

Add '1.333333333' to each side of the equation.
-1.333333333 + 4.666666667k + 1.333333333 + k2 = 0 + 1.333333333

Reorder the terms:
-1.333333333 + 1.333333333 + 4.666666667k + k2 = 0 + 1.333333333

Combine like terms: -1.333333333 + 1.333333333 = 0.000000000
0.000000000 + 4.666666667k + k2 = 0 + 1.333333333
4.666666667k + k2 = 0 + 1.333333333

Combine like terms: 0 + 1.333333333 = 1.333333333
4.666666667k + k2 = 1.333333333

The k term is 4.666666667k.  Take half its coefficient (2.333333334).
Square it (5.444444448) and add it to both sides.

Add '5.444444448' to each side of the equation.
4.666666667k + 5.444444448 + k2 = 1.333333333 + 5.444444448

Reorder the terms:
5.444444448 + 4.666666667k + k2 = 1.333333333 + 5.444444448

Combine like terms: 1.333333333 + 5.444444448 = 6.777777781
5.444444448 + 4.666666667k + k2 = 6.777777781

Factor a perfect square on the left side:
(k + 2.333333334)(k + 2.333333334) = 6.777777781

Calculate the square root of the right side: 2.603416559

Break this problem into two subproblems by setting 
(k + 2.333333334) equal to 2.603416559 and -2.603416559.

Subproblem 1

k + 2.333333334 = 2.603416559 Simplifying k + 2.333333334 = 2.603416559 Reorder the terms: 2.333333334 + k = 2.603416559 Solving 2.333333334 + k = 2.603416559 Solving for variable 'k'. Move all terms containing k to the left, all other terms to the right. Add '-2.333333334' to each side of the equation. 2.333333334 + -2.333333334 + k = 2.603416559 + -2.333333334 Combine like terms: 2.333333334 + -2.333333334 = 0.000000000 0.000000000 + k = 2.603416559 + -2.333333334 k = 2.603416559 + -2.333333334 Combine like terms: 2.603416559 + -2.333333334 = 0.270083225 k = 0.270083225 Simplifying k = 0.270083225

Subproblem 2

k + 2.333333334 = -2.603416559 Simplifying k + 2.333333334 = -2.603416559 Reorder the terms: 2.333333334 + k = -2.603416559 Solving 2.333333334 + k = -2.603416559 Solving for variable 'k'. Move all terms containing k to the left, all other terms to the right. Add '-2.333333334' to each side of the equation. 2.333333334 + -2.333333334 + k = -2.603416559 + -2.333333334 Combine like terms: 2.333333334 + -2.333333334 = 0.000000000 0.000000000 + k = -2.603416559 + -2.333333334 k = -2.603416559 + -2.333333334 Combine like terms: -2.603416559 + -2.333333334 = -4.936749893 k = -4.936749893 Simplifying k = -4.936749893

Solution

The solution to the problem is based on the solutions from the subproblems. k = {0.270083225, -4.936749893}

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