t^2-3t-6=5

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Solution for t^2-3t-6=5 equation:


Simplifying
t2 + -3t + -6 = 5

Reorder the terms:
-6 + -3t + t2 = 5

Solving
-6 + -3t + t2 = 5

Solving for variable 't'.

Reorder the terms:
-6 + -5 + -3t + t2 = 5 + -5

Combine like terms: -6 + -5 = -11
-11 + -3t + t2 = 5 + -5

Combine like terms: 5 + -5 = 0
-11 + -3t + t2 = 0

Begin completing the square.

Move the constant term to the right:

Add '11' to each side of the equation.
-11 + -3t + 11 + t2 = 0 + 11

Reorder the terms:
-11 + 11 + -3t + t2 = 0 + 11

Combine like terms: -11 + 11 = 0
0 + -3t + t2 = 0 + 11
-3t + t2 = 0 + 11

Combine like terms: 0 + 11 = 11
-3t + t2 = 11

The t term is -3t.  Take half its coefficient (-1.5).
Square it (2.25) and add it to both sides.

Add '2.25' to each side of the equation.
-3t + 2.25 + t2 = 11 + 2.25

Reorder the terms:
2.25 + -3t + t2 = 11 + 2.25

Combine like terms: 11 + 2.25 = 13.25
2.25 + -3t + t2 = 13.25

Factor a perfect square on the left side:
(t + -1.5)(t + -1.5) = 13.25

Calculate the square root of the right side: 3.640054945

Break this problem into two subproblems by setting 
(t + -1.5) equal to 3.640054945 and -3.640054945.

Subproblem 1

t + -1.5 = 3.640054945 Simplifying t + -1.5 = 3.640054945 Reorder the terms: -1.5 + t = 3.640054945 Solving -1.5 + t = 3.640054945 Solving for variable 't'. Move all terms containing t to the left, all other terms to the right. Add '1.5' to each side of the equation. -1.5 + 1.5 + t = 3.640054945 + 1.5 Combine like terms: -1.5 + 1.5 = 0.0 0.0 + t = 3.640054945 + 1.5 t = 3.640054945 + 1.5 Combine like terms: 3.640054945 + 1.5 = 5.140054945 t = 5.140054945 Simplifying t = 5.140054945

Subproblem 2

t + -1.5 = -3.640054945 Simplifying t + -1.5 = -3.640054945 Reorder the terms: -1.5 + t = -3.640054945 Solving -1.5 + t = -3.640054945 Solving for variable 't'. Move all terms containing t to the left, all other terms to the right. Add '1.5' to each side of the equation. -1.5 + 1.5 + t = -3.640054945 + 1.5 Combine like terms: -1.5 + 1.5 = 0.0 0.0 + t = -3.640054945 + 1.5 t = -3.640054945 + 1.5 Combine like terms: -3.640054945 + 1.5 = -2.140054945 t = -2.140054945 Simplifying t = -2.140054945

Solution

The solution to the problem is based on the solutions from the subproblems. t = {5.140054945, -2.140054945}

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