(2f-3)f=18

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Solution for (2f-3)f=18 equation:


Simplifying
(2f + -3) * f = 18

Reorder the terms:
(-3 + 2f) * f = 18

Reorder the terms for easier multiplication:
f(-3 + 2f) = 18
(-3 * f + 2f * f) = 18
(-3f + 2f2) = 18

Solving
-3f + 2f2 = 18

Solving for variable 'f'.

Reorder the terms:
-18 + -3f + 2f2 = 18 + -18

Combine like terms: 18 + -18 = 0
-18 + -3f + 2f2 = 0

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

Divide each side by '2'.
-9 + -1.5f + f2 = 0

Move the constant term to the right:

Add '9' to each side of the equation.
-9 + -1.5f + 9 + f2 = 0 + 9

Reorder the terms:
-9 + 9 + -1.5f + f2 = 0 + 9

Combine like terms: -9 + 9 = 0
0 + -1.5f + f2 = 0 + 9
-1.5f + f2 = 0 + 9

Combine like terms: 0 + 9 = 9
-1.5f + f2 = 9

The f term is -1.5f.  Take half its coefficient (-0.75).
Square it (0.5625) and add it to both sides.

Add '0.5625' to each side of the equation.
-1.5f + 0.5625 + f2 = 9 + 0.5625

Reorder the terms:
0.5625 + -1.5f + f2 = 9 + 0.5625

Combine like terms: 9 + 0.5625 = 9.5625
0.5625 + -1.5f + f2 = 9.5625

Factor a perfect square on the left side:
(f + -0.75)(f + -0.75) = 9.5625

Calculate the square root of the right side: 3.092329219

Break this problem into two subproblems by setting 
(f + -0.75) equal to 3.092329219 and -3.092329219.

Subproblem 1

f + -0.75 = 3.092329219 Simplifying f + -0.75 = 3.092329219 Reorder the terms: -0.75 + f = 3.092329219 Solving -0.75 + f = 3.092329219 Solving for variable 'f'. Move all terms containing f to the left, all other terms to the right. Add '0.75' to each side of the equation. -0.75 + 0.75 + f = 3.092329219 + 0.75 Combine like terms: -0.75 + 0.75 = 0.00 0.00 + f = 3.092329219 + 0.75 f = 3.092329219 + 0.75 Combine like terms: 3.092329219 + 0.75 = 3.842329219 f = 3.842329219 Simplifying f = 3.842329219

Subproblem 2

f + -0.75 = -3.092329219 Simplifying f + -0.75 = -3.092329219 Reorder the terms: -0.75 + f = -3.092329219 Solving -0.75 + f = -3.092329219 Solving for variable 'f'. Move all terms containing f to the left, all other terms to the right. Add '0.75' to each side of the equation. -0.75 + 0.75 + f = -3.092329219 + 0.75 Combine like terms: -0.75 + 0.75 = 0.00 0.00 + f = -3.092329219 + 0.75 f = -3.092329219 + 0.75 Combine like terms: -3.092329219 + 0.75 = -2.342329219 f = -2.342329219 Simplifying f = -2.342329219

Solution

The solution to the problem is based on the solutions from the subproblems. f = {3.842329219, -2.342329219}

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