20f(-8f-15)=3(4f-5)

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Solution for 20f(-8f-15)=3(4f-5) equation:


Simplifying
20f(-8f + -15) = 3(4f + -5)

Reorder the terms:
20f(-15 + -8f) = 3(4f + -5)
(-15 * 20f + -8f * 20f) = 3(4f + -5)
(-300f + -160f2) = 3(4f + -5)

Reorder the terms:
-300f + -160f2 = 3(-5 + 4f)
-300f + -160f2 = (-5 * 3 + 4f * 3)
-300f + -160f2 = (-15 + 12f)

Solving
-300f + -160f2 = -15 + 12f

Solving for variable 'f'.

Reorder the terms:
15 + -300f + -12f + -160f2 = -15 + 12f + 15 + -12f

Combine like terms: -300f + -12f = -312f
15 + -312f + -160f2 = -15 + 12f + 15 + -12f

Reorder the terms:
15 + -312f + -160f2 = -15 + 15 + 12f + -12f

Combine like terms: -15 + 15 = 0
15 + -312f + -160f2 = 0 + 12f + -12f
15 + -312f + -160f2 = 12f + -12f

Combine like terms: 12f + -12f = 0
15 + -312f + -160f2 = 0

Begin completing the square.  Divide all terms by
-160 the coefficient of the squared term: 

Divide each side by '-160'.
-0.09375 + 1.95f + f2 = 0.0

Move the constant term to the right:

Add '0.09375' to each side of the equation.
-0.09375 + 1.95f + 0.09375 + f2 = 0.0 + 0.09375

Reorder the terms:
-0.09375 + 0.09375 + 1.95f + f2 = 0.0 + 0.09375

Combine like terms: -0.09375 + 0.09375 = 0.00000
0.00000 + 1.95f + f2 = 0.0 + 0.09375
1.95f + f2 = 0.0 + 0.09375

Combine like terms: 0.0 + 0.09375 = 0.09375
1.95f + f2 = 0.09375

The f term is 1.95f.  Take half its coefficient (0.975).
Square it (0.950625) and add it to both sides.

Add '0.950625' to each side of the equation.
1.95f + 0.950625 + f2 = 0.09375 + 0.950625

Reorder the terms:
0.950625 + 1.95f + f2 = 0.09375 + 0.950625

Combine like terms: 0.09375 + 0.950625 = 1.044375
0.950625 + 1.95f + f2 = 1.044375

Factor a perfect square on the left side:
(f + 0.975)(f + 0.975) = 1.044375

Calculate the square root of the right side: 1.021946672

Break this problem into two subproblems by setting 
(f + 0.975) equal to 1.021946672 and -1.021946672.

Subproblem 1

f + 0.975 = 1.021946672 Simplifying f + 0.975 = 1.021946672 Reorder the terms: 0.975 + f = 1.021946672 Solving 0.975 + f = 1.021946672 Solving for variable 'f'. Move all terms containing f to the left, all other terms to the right. Add '-0.975' to each side of the equation. 0.975 + -0.975 + f = 1.021946672 + -0.975 Combine like terms: 0.975 + -0.975 = 0.000 0.000 + f = 1.021946672 + -0.975 f = 1.021946672 + -0.975 Combine like terms: 1.021946672 + -0.975 = 0.046946672 f = 0.046946672 Simplifying f = 0.046946672

Subproblem 2

f + 0.975 = -1.021946672 Simplifying f + 0.975 = -1.021946672 Reorder the terms: 0.975 + f = -1.021946672 Solving 0.975 + f = -1.021946672 Solving for variable 'f'. Move all terms containing f to the left, all other terms to the right. Add '-0.975' to each side of the equation. 0.975 + -0.975 + f = -1.021946672 + -0.975 Combine like terms: 0.975 + -0.975 = 0.000 0.000 + f = -1.021946672 + -0.975 f = -1.021946672 + -0.975 Combine like terms: -1.021946672 + -0.975 = -1.996946672 f = -1.996946672 Simplifying f = -1.996946672

Solution

The solution to the problem is based on the solutions from the subproblems. f = {0.046946672, -1.996946672}

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