(5k^2+8k+2)-(2k+3)=

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Solution for (5k^2+8k+2)-(2k+3)= equation:


Simplifying
(5k2 + 8k + 2) + -1(2k + 3) = 0

Reorder the terms:
(2 + 8k + 5k2) + -1(2k + 3) = 0

Remove parenthesis around (2 + 8k + 5k2)
2 + 8k + 5k2 + -1(2k + 3) = 0

Reorder the terms:
2 + 8k + 5k2 + -1(3 + 2k) = 0
2 + 8k + 5k2 + (3 * -1 + 2k * -1) = 0
2 + 8k + 5k2 + (-3 + -2k) = 0

Reorder the terms:
2 + -3 + 8k + -2k + 5k2 = 0

Combine like terms: 2 + -3 = -1
-1 + 8k + -2k + 5k2 = 0

Combine like terms: 8k + -2k = 6k
-1 + 6k + 5k2 = 0

Solving
-1 + 6k + 5k2 = 0

Solving for variable 'k'.

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

Divide each side by '5'.
-0.2 + 1.2k + k2 = 0

Move the constant term to the right:

Add '0.2' to each side of the equation.
-0.2 + 1.2k + 0.2 + k2 = 0 + 0.2

Reorder the terms:
-0.2 + 0.2 + 1.2k + k2 = 0 + 0.2

Combine like terms: -0.2 + 0.2 = 0.0
0.0 + 1.2k + k2 = 0 + 0.2
1.2k + k2 = 0 + 0.2

Combine like terms: 0 + 0.2 = 0.2
1.2k + k2 = 0.2

The k term is 1.2k.  Take half its coefficient (0.6).
Square it (0.36) and add it to both sides.

Add '0.36' to each side of the equation.
1.2k + 0.36 + k2 = 0.2 + 0.36

Reorder the terms:
0.36 + 1.2k + k2 = 0.2 + 0.36

Combine like terms: 0.2 + 0.36 = 0.56
0.36 + 1.2k + k2 = 0.56

Factor a perfect square on the left side:
(k + 0.6)(k + 0.6) = 0.56

Calculate the square root of the right side: 0.748331477

Break this problem into two subproblems by setting 
(k + 0.6) equal to 0.748331477 and -0.748331477.

Subproblem 1

k + 0.6 = 0.748331477 Simplifying k + 0.6 = 0.748331477 Reorder the terms: 0.6 + k = 0.748331477 Solving 0.6 + k = 0.748331477 Solving for variable 'k'. Move all terms containing k to the left, all other terms to the right. Add '-0.6' to each side of the equation. 0.6 + -0.6 + k = 0.748331477 + -0.6 Combine like terms: 0.6 + -0.6 = 0.0 0.0 + k = 0.748331477 + -0.6 k = 0.748331477 + -0.6 Combine like terms: 0.748331477 + -0.6 = 0.148331477 k = 0.148331477 Simplifying k = 0.148331477

Subproblem 2

k + 0.6 = -0.748331477 Simplifying k + 0.6 = -0.748331477 Reorder the terms: 0.6 + k = -0.748331477 Solving 0.6 + k = -0.748331477 Solving for variable 'k'. Move all terms containing k to the left, all other terms to the right. Add '-0.6' to each side of the equation. 0.6 + -0.6 + k = -0.748331477 + -0.6 Combine like terms: 0.6 + -0.6 = 0.0 0.0 + k = -0.748331477 + -0.6 k = -0.748331477 + -0.6 Combine like terms: -0.748331477 + -0.6 = -1.348331477 k = -1.348331477 Simplifying k = -1.348331477

Solution

The solution to the problem is based on the solutions from the subproblems. k = {0.148331477, -1.348331477}

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