4f^2+36f+81=0

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Solution for 4f^2+36f+81=0 equation:


Simplifying
4f2 + 36f + 81 = 0

Reorder the terms:
81 + 36f + 4f2 = 0

Solving
81 + 36f + 4f2 = 0

Solving for variable 'f'.

Factor a trinomial.
(9 + 2f)(9 + 2f) = 0

Subproblem 1

Set the factor '(9 + 2f)' equal to zero and attempt to solve: Simplifying 9 + 2f = 0 Solving 9 + 2f = 0 Move all terms containing f to the left, all other terms to the right. Add '-9' to each side of the equation. 9 + -9 + 2f = 0 + -9 Combine like terms: 9 + -9 = 0 0 + 2f = 0 + -9 2f = 0 + -9 Combine like terms: 0 + -9 = -9 2f = -9 Divide each side by '2'. f = -4.5 Simplifying f = -4.5

Subproblem 2

Set the factor '(9 + 2f)' equal to zero and attempt to solve: Simplifying 9 + 2f = 0 Solving 9 + 2f = 0 Move all terms containing f to the left, all other terms to the right. Add '-9' to each side of the equation. 9 + -9 + 2f = 0 + -9 Combine like terms: 9 + -9 = 0 0 + 2f = 0 + -9 2f = 0 + -9 Combine like terms: 0 + -9 = -9 2f = -9 Divide each side by '2'. f = -4.5 Simplifying f = -4.5

Solution

f = {-4.5, -4.5}

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