0=-8t^2-9t+105

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Solution for 0=-8t^2-9t+105 equation:


Simplifying
0 = -8t2 + -9t + 105

Reorder the terms:
0 = 105 + -9t + -8t2

Solving
0 = 105 + -9t + -8t2

Solving for variable 't'.

Combine like terms: 0 + -105 = -105
-105 + 9t + 8t2 = 105 + -9t + -8t2 + -105 + 9t + 8t2

Reorder the terms:
-105 + 9t + 8t2 = 105 + -105 + -9t + 9t + -8t2 + 8t2

Combine like terms: 105 + -105 = 0
-105 + 9t + 8t2 = 0 + -9t + 9t + -8t2 + 8t2
-105 + 9t + 8t2 = -9t + 9t + -8t2 + 8t2

Combine like terms: -9t + 9t = 0
-105 + 9t + 8t2 = 0 + -8t2 + 8t2
-105 + 9t + 8t2 = -8t2 + 8t2

Combine like terms: -8t2 + 8t2 = 0
-105 + 9t + 8t2 = 0

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

Divide each side by '8'.
-13.125 + 1.125t + t2 = 0

Move the constant term to the right:

Add '13.125' to each side of the equation.
-13.125 + 1.125t + 13.125 + t2 = 0 + 13.125

Reorder the terms:
-13.125 + 13.125 + 1.125t + t2 = 0 + 13.125

Combine like terms: -13.125 + 13.125 = 0.000
0.000 + 1.125t + t2 = 0 + 13.125
1.125t + t2 = 0 + 13.125

Combine like terms: 0 + 13.125 = 13.125
1.125t + t2 = 13.125

The t term is 1.125t.  Take half its coefficient (0.5625).
Square it (0.31640625) and add it to both sides.

Add '0.31640625' to each side of the equation.
1.125t + 0.31640625 + t2 = 13.125 + 0.31640625

Reorder the terms:
0.31640625 + 1.125t + t2 = 13.125 + 0.31640625

Combine like terms: 13.125 + 0.31640625 = 13.44140625
0.31640625 + 1.125t + t2 = 13.44140625

Factor a perfect square on the left side:
(t + 0.5625)(t + 0.5625) = 13.44140625

Calculate the square root of the right side: 3.666252344

Break this problem into two subproblems by setting 
(t + 0.5625) equal to 3.666252344 and -3.666252344.

Subproblem 1

t + 0.5625 = 3.666252344 Simplifying t + 0.5625 = 3.666252344 Reorder the terms: 0.5625 + t = 3.666252344 Solving 0.5625 + t = 3.666252344 Solving for variable 't'. Move all terms containing t to the left, all other terms to the right. Add '-0.5625' to each side of the equation. 0.5625 + -0.5625 + t = 3.666252344 + -0.5625 Combine like terms: 0.5625 + -0.5625 = 0.0000 0.0000 + t = 3.666252344 + -0.5625 t = 3.666252344 + -0.5625 Combine like terms: 3.666252344 + -0.5625 = 3.103752344 t = 3.103752344 Simplifying t = 3.103752344

Subproblem 2

t + 0.5625 = -3.666252344 Simplifying t + 0.5625 = -3.666252344 Reorder the terms: 0.5625 + t = -3.666252344 Solving 0.5625 + t = -3.666252344 Solving for variable 't'. Move all terms containing t to the left, all other terms to the right. Add '-0.5625' to each side of the equation. 0.5625 + -0.5625 + t = -3.666252344 + -0.5625 Combine like terms: 0.5625 + -0.5625 = 0.0000 0.0000 + t = -3.666252344 + -0.5625 t = -3.666252344 + -0.5625 Combine like terms: -3.666252344 + -0.5625 = -4.228752344 t = -4.228752344 Simplifying t = -4.228752344

Solution

The solution to the problem is based on the solutions from the subproblems. t = {3.103752344, -4.228752344}

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