(4f+5)(5f+40)=180

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Solution for (4f+5)(5f+40)=180 equation:


Simplifying
(4f + 5)(5f + 40) = 180

Reorder the terms:
(5 + 4f)(5f + 40) = 180

Reorder the terms:
(5 + 4f)(40 + 5f) = 180

Multiply (5 + 4f) * (40 + 5f)
(5(40 + 5f) + 4f * (40 + 5f)) = 180
((40 * 5 + 5f * 5) + 4f * (40 + 5f)) = 180
((200 + 25f) + 4f * (40 + 5f)) = 180
(200 + 25f + (40 * 4f + 5f * 4f)) = 180
(200 + 25f + (160f + 20f2)) = 180

Combine like terms: 25f + 160f = 185f
(200 + 185f + 20f2) = 180

Solving
200 + 185f + 20f2 = 180

Solving for variable 'f'.

Reorder the terms:
200 + -180 + 185f + 20f2 = 180 + -180

Combine like terms: 200 + -180 = 20
20 + 185f + 20f2 = 180 + -180

Combine like terms: 180 + -180 = 0
20 + 185f + 20f2 = 0

Factor out the Greatest Common Factor (GCF), '5'.
5(4 + 37f + 4f2) = 0

Ignore the factor 5.

Subproblem 1

Set the factor '(4 + 37f + 4f2)' equal to zero and attempt to solve: Simplifying 4 + 37f + 4f2 = 0 Solving 4 + 37f + 4f2 = 0 Begin completing the square. Divide all terms by 4 the coefficient of the squared term: Divide each side by '4'. 1 + 9.25f + f2 = 0 Move the constant term to the right: Add '-1' to each side of the equation. 1 + 9.25f + -1 + f2 = 0 + -1 Reorder the terms: 1 + -1 + 9.25f + f2 = 0 + -1 Combine like terms: 1 + -1 = 0 0 + 9.25f + f2 = 0 + -1 9.25f + f2 = 0 + -1 Combine like terms: 0 + -1 = -1 9.25f + f2 = -1 The f term is 9.25f. Take half its coefficient (4.625). Square it (21.390625) and add it to both sides. Add '21.390625' to each side of the equation. 9.25f + 21.390625 + f2 = -1 + 21.390625 Reorder the terms: 21.390625 + 9.25f + f2 = -1 + 21.390625 Combine like terms: -1 + 21.390625 = 20.390625 21.390625 + 9.25f + f2 = 20.390625 Factor a perfect square on the left side: (f + 4.625)(f + 4.625) = 20.390625 Calculate the square root of the right side: 4.515597967 Break this problem into two subproblems by setting (f + 4.625) equal to 4.515597967 and -4.515597967.

Subproblem 1

f + 4.625 = 4.515597967 Simplifying f + 4.625 = 4.515597967 Reorder the terms: 4.625 + f = 4.515597967 Solving 4.625 + f = 4.515597967 Solving for variable 'f'. Move all terms containing f to the left, all other terms to the right. Add '-4.625' to each side of the equation. 4.625 + -4.625 + f = 4.515597967 + -4.625 Combine like terms: 4.625 + -4.625 = 0.000 0.000 + f = 4.515597967 + -4.625 f = 4.515597967 + -4.625 Combine like terms: 4.515597967 + -4.625 = -0.109402033 f = -0.109402033 Simplifying f = -0.109402033

Subproblem 2

f + 4.625 = -4.515597967 Simplifying f + 4.625 = -4.515597967 Reorder the terms: 4.625 + f = -4.515597967 Solving 4.625 + f = -4.515597967 Solving for variable 'f'. Move all terms containing f to the left, all other terms to the right. Add '-4.625' to each side of the equation. 4.625 + -4.625 + f = -4.515597967 + -4.625 Combine like terms: 4.625 + -4.625 = 0.000 0.000 + f = -4.515597967 + -4.625 f = -4.515597967 + -4.625 Combine like terms: -4.515597967 + -4.625 = -9.140597967 f = -9.140597967 Simplifying f = -9.140597967

Solution

The solution to the problem is based on the solutions from the subproblems. f = {-0.109402033, -9.140597967}

Solution

f = {-0.109402033, -9.140597967}

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