t^2-2t-8.5=0

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Solution for t^2-2t-8.5=0 equation:


Simplifying
t2 + -2t + -8.5 = 0

Reorder the terms:
-8.5 + -2t + t2 = 0

Solving
-8.5 + -2t + t2 = 0

Solving for variable 't'.

Begin completing the square.

Move the constant term to the right:

Add '8.5' to each side of the equation.
-8.5 + -2t + 8.5 + t2 = 0 + 8.5

Reorder the terms:
-8.5 + 8.5 + -2t + t2 = 0 + 8.5

Combine like terms: -8.5 + 8.5 = 0.0
0.0 + -2t + t2 = 0 + 8.5
-2t + t2 = 0 + 8.5

Combine like terms: 0 + 8.5 = 8.5
-2t + t2 = 8.5

The t term is -2t.  Take half its coefficient (-1).
Square it (1) and add it to both sides.

Add '1' to each side of the equation.
-2t + 1 + t2 = 8.5 + 1

Reorder the terms:
1 + -2t + t2 = 8.5 + 1

Combine like terms: 8.5 + 1 = 9.5
1 + -2t + t2 = 9.5

Factor a perfect square on the left side:
(t + -1)(t + -1) = 9.5

Calculate the square root of the right side: 3.082207001

Break this problem into two subproblems by setting 
(t + -1) equal to 3.082207001 and -3.082207001.

Subproblem 1

t + -1 = 3.082207001 Simplifying t + -1 = 3.082207001 Reorder the terms: -1 + t = 3.082207001 Solving -1 + t = 3.082207001 Solving for variable 't'. Move all terms containing t to the left, all other terms to the right. Add '1' to each side of the equation. -1 + 1 + t = 3.082207001 + 1 Combine like terms: -1 + 1 = 0 0 + t = 3.082207001 + 1 t = 3.082207001 + 1 Combine like terms: 3.082207001 + 1 = 4.082207001 t = 4.082207001 Simplifying t = 4.082207001

Subproblem 2

t + -1 = -3.082207001 Simplifying t + -1 = -3.082207001 Reorder the terms: -1 + t = -3.082207001 Solving -1 + t = -3.082207001 Solving for variable 't'. Move all terms containing t to the left, all other terms to the right. Add '1' to each side of the equation. -1 + 1 + t = -3.082207001 + 1 Combine like terms: -1 + 1 = 0 0 + t = -3.082207001 + 1 t = -3.082207001 + 1 Combine like terms: -3.082207001 + 1 = -2.082207001 t = -2.082207001 Simplifying t = -2.082207001

Solution

The solution to the problem is based on the solutions from the subproblems. t = {4.082207001, -2.082207001}

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