15f^2+37f=18

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Solution for 15f^2+37f=18 equation:


Simplifying
15f2 + 37f = 18

Reorder the terms:
37f + 15f2 = 18

Solving
37f + 15f2 = 18

Solving for variable 'f'.

Reorder the terms:
-18 + 37f + 15f2 = 18 + -18

Combine like terms: 18 + -18 = 0
-18 + 37f + 15f2 = 0

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

Divide each side by '15'.
-1.2 + 2.466666667f + f2 = 0

Move the constant term to the right:

Add '1.2' to each side of the equation.
-1.2 + 2.466666667f + 1.2 + f2 = 0 + 1.2

Reorder the terms:
-1.2 + 1.2 + 2.466666667f + f2 = 0 + 1.2

Combine like terms: -1.2 + 1.2 = 0.0
0.0 + 2.466666667f + f2 = 0 + 1.2
2.466666667f + f2 = 0 + 1.2

Combine like terms: 0 + 1.2 = 1.2
2.466666667f + f2 = 1.2

The f term is 2.466666667f.  Take half its coefficient (1.233333334).
Square it (1.521111113) and add it to both sides.

Add '1.521111113' to each side of the equation.
2.466666667f + 1.521111113 + f2 = 1.2 + 1.521111113

Reorder the terms:
1.521111113 + 2.466666667f + f2 = 1.2 + 1.521111113

Combine like terms: 1.2 + 1.521111113 = 2.721111113
1.521111113 + 2.466666667f + f2 = 2.721111113

Factor a perfect square on the left side:
(f + 1.233333334)(f + 1.233333334) = 2.721111113

Calculate the square root of the right side: 1.649579071

Break this problem into two subproblems by setting 
(f + 1.233333334) equal to 1.649579071 and -1.649579071.

Subproblem 1

f + 1.233333334 = 1.649579071 Simplifying f + 1.233333334 = 1.649579071 Reorder the terms: 1.233333334 + f = 1.649579071 Solving 1.233333334 + f = 1.649579071 Solving for variable 'f'. Move all terms containing f to the left, all other terms to the right. Add '-1.233333334' to each side of the equation. 1.233333334 + -1.233333334 + f = 1.649579071 + -1.233333334 Combine like terms: 1.233333334 + -1.233333334 = 0.000000000 0.000000000 + f = 1.649579071 + -1.233333334 f = 1.649579071 + -1.233333334 Combine like terms: 1.649579071 + -1.233333334 = 0.416245737 f = 0.416245737 Simplifying f = 0.416245737

Subproblem 2

f + 1.233333334 = -1.649579071 Simplifying f + 1.233333334 = -1.649579071 Reorder the terms: 1.233333334 + f = -1.649579071 Solving 1.233333334 + f = -1.649579071 Solving for variable 'f'. Move all terms containing f to the left, all other terms to the right. Add '-1.233333334' to each side of the equation. 1.233333334 + -1.233333334 + f = -1.649579071 + -1.233333334 Combine like terms: 1.233333334 + -1.233333334 = 0.000000000 0.000000000 + f = -1.649579071 + -1.233333334 f = -1.649579071 + -1.233333334 Combine like terms: -1.649579071 + -1.233333334 = -2.882912405 f = -2.882912405 Simplifying f = -2.882912405

Solution

The solution to the problem is based on the solutions from the subproblems. f = {0.416245737, -2.882912405}

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