3t^2-18t-25=0

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Solution for 3t^2-18t-25=0 equation:


Simplifying
3t2 + -18t + -25 = 0

Reorder the terms:
-25 + -18t + 3t2 = 0

Solving
-25 + -18t + 3t2 = 0

Solving for variable 't'.

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

Divide each side by '3'.
-8.333333333 + -6t + t2 = 0

Move the constant term to the right:

Add '8.333333333' to each side of the equation.
-8.333333333 + -6t + 8.333333333 + t2 = 0 + 8.333333333

Reorder the terms:
-8.333333333 + 8.333333333 + -6t + t2 = 0 + 8.333333333

Combine like terms: -8.333333333 + 8.333333333 = 0.000000000
0.000000000 + -6t + t2 = 0 + 8.333333333
-6t + t2 = 0 + 8.333333333

Combine like terms: 0 + 8.333333333 = 8.333333333
-6t + t2 = 8.333333333

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 = 8.333333333 + 9

Reorder the terms:
9 + -6t + t2 = 8.333333333 + 9

Combine like terms: 8.333333333 + 9 = 17.333333333
9 + -6t + t2 = 17.333333333

Factor a perfect square on the left side:
(t + -3)(t + -3) = 17.333333333

Calculate the square root of the right side: 4.163331999

Break this problem into two subproblems by setting 
(t + -3) equal to 4.163331999 and -4.163331999.

Subproblem 1

t + -3 = 4.163331999 Simplifying t + -3 = 4.163331999 Reorder the terms: -3 + t = 4.163331999 Solving -3 + t = 4.163331999 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 = 4.163331999 + 3 Combine like terms: -3 + 3 = 0 0 + t = 4.163331999 + 3 t = 4.163331999 + 3 Combine like terms: 4.163331999 + 3 = 7.163331999 t = 7.163331999 Simplifying t = 7.163331999

Subproblem 2

t + -3 = -4.163331999 Simplifying t + -3 = -4.163331999 Reorder the terms: -3 + t = -4.163331999 Solving -3 + t = -4.163331999 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 = -4.163331999 + 3 Combine like terms: -3 + 3 = 0 0 + t = -4.163331999 + 3 t = -4.163331999 + 3 Combine like terms: -4.163331999 + 3 = -1.163331999 t = -1.163331999 Simplifying t = -1.163331999

Solution

The solution to the problem is based on the solutions from the subproblems. t = {7.163331999, -1.163331999}

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