t^2-6t-18=0

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Solution for t^2-6t-18=0 equation:


Simplifying
t2 + -6t + -18 = 0

Reorder the terms:
-18 + -6t + t2 = 0

Solving
-18 + -6t + t2 = 0

Solving for variable 't'.

Begin completing the square.

Move the constant term to the right:

Add '18' to each side of the equation.
-18 + -6t + 18 + t2 = 0 + 18

Reorder the terms:
-18 + 18 + -6t + t2 = 0 + 18

Combine like terms: -18 + 18 = 0
0 + -6t + t2 = 0 + 18
-6t + t2 = 0 + 18

Combine like terms: 0 + 18 = 18
-6t + t2 = 18

The t term is -6t.  Take half its coefficient (-3).
Square it (9) and add it to both sides.

Add '9' to each side of the equation.
-6t + 9 + t2 = 18 + 9

Reorder the terms:
9 + -6t + t2 = 18 + 9

Combine like terms: 18 + 9 = 27
9 + -6t + t2 = 27

Factor a perfect square on the left side:
(t + -3)(t + -3) = 27

Calculate the square root of the right side: 5.196152423

Break this problem into two subproblems by setting 
(t + -3) equal to 5.196152423 and -5.196152423.

Subproblem 1

t + -3 = 5.196152423 Simplifying t + -3 = 5.196152423 Reorder the terms: -3 + t = 5.196152423 Solving -3 + t = 5.196152423 Solving for variable 't'. Move all terms containing t to the left, all other terms to the right. Add '3' to each side of the equation. -3 + 3 + t = 5.196152423 + 3 Combine like terms: -3 + 3 = 0 0 + t = 5.196152423 + 3 t = 5.196152423 + 3 Combine like terms: 5.196152423 + 3 = 8.196152423 t = 8.196152423 Simplifying t = 8.196152423

Subproblem 2

t + -3 = -5.196152423 Simplifying t + -3 = -5.196152423 Reorder the terms: -3 + t = -5.196152423 Solving -3 + t = -5.196152423 Solving for variable 't'. Move all terms containing t to the left, all other terms to the right. Add '3' to each side of the equation. -3 + 3 + t = -5.196152423 + 3 Combine like terms: -3 + 3 = 0 0 + t = -5.196152423 + 3 t = -5.196152423 + 3 Combine like terms: -5.196152423 + 3 = -2.196152423 t = -2.196152423 Simplifying t = -2.196152423

Solution

The solution to the problem is based on the solutions from the subproblems. t = {8.196152423, -2.196152423}

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