t^2+36t+81=0

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Solution for t^2+36t+81=0 equation:


Simplifying
t2 + 36t + 81 = 0

Reorder the terms:
81 + 36t + t2 = 0

Solving
81 + 36t + t2 = 0

Solving for variable 't'.

Begin completing the square.

Move the constant term to the right:

Add '-81' to each side of the equation.
81 + 36t + -81 + t2 = 0 + -81

Reorder the terms:
81 + -81 + 36t + t2 = 0 + -81

Combine like terms: 81 + -81 = 0
0 + 36t + t2 = 0 + -81
36t + t2 = 0 + -81

Combine like terms: 0 + -81 = -81
36t + t2 = -81

The t term is 36t.  Take half its coefficient (18).
Square it (324) and add it to both sides.

Add '324' to each side of the equation.
36t + 324 + t2 = -81 + 324

Reorder the terms:
324 + 36t + t2 = -81 + 324

Combine like terms: -81 + 324 = 243
324 + 36t + t2 = 243

Factor a perfect square on the left side:
(t + 18)(t + 18) = 243

Calculate the square root of the right side: 15.588457268

Break this problem into two subproblems by setting 
(t + 18) equal to 15.588457268 and -15.588457268.

Subproblem 1

t + 18 = 15.588457268 Simplifying t + 18 = 15.588457268 Reorder the terms: 18 + t = 15.588457268 Solving 18 + t = 15.588457268 Solving for variable 't'. Move all terms containing t to the left, all other terms to the right. Add '-18' to each side of the equation. 18 + -18 + t = 15.588457268 + -18 Combine like terms: 18 + -18 = 0 0 + t = 15.588457268 + -18 t = 15.588457268 + -18 Combine like terms: 15.588457268 + -18 = -2.411542732 t = -2.411542732 Simplifying t = -2.411542732

Subproblem 2

t + 18 = -15.588457268 Simplifying t + 18 = -15.588457268 Reorder the terms: 18 + t = -15.588457268 Solving 18 + t = -15.588457268 Solving for variable 't'. Move all terms containing t to the left, all other terms to the right. Add '-18' to each side of the equation. 18 + -18 + t = -15.588457268 + -18 Combine like terms: 18 + -18 = 0 0 + t = -15.588457268 + -18 t = -15.588457268 + -18 Combine like terms: -15.588457268 + -18 = -33.588457268 t = -33.588457268 Simplifying t = -33.588457268

Solution

The solution to the problem is based on the solutions from the subproblems. t = {-2.411542732, -33.588457268}

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