6=-.5t^2+6t-9

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Solution for 6=-.5t^2+6t-9 equation:


Simplifying
6 = -0.5t2 + 6t + -9

Reorder the terms:
6 = -9 + 6t + -0.5t2

Solving
6 = -9 + 6t + -0.5t2

Solving for variable 't'.

Combine like terms: 6 + 9 = 15
15 + -6t + 0.5t2 = -9 + 6t + -0.5t2 + 9 + -6t + 0.5t2

Reorder the terms:
15 + -6t + 0.5t2 = -9 + 9 + 6t + -6t + -0.5t2 + 0.5t2

Combine like terms: -9 + 9 = 0
15 + -6t + 0.5t2 = 0 + 6t + -6t + -0.5t2 + 0.5t2
15 + -6t + 0.5t2 = 6t + -6t + -0.5t2 + 0.5t2

Combine like terms: 6t + -6t = 0
15 + -6t + 0.5t2 = 0 + -0.5t2 + 0.5t2
15 + -6t + 0.5t2 = -0.5t2 + 0.5t2

Combine like terms: -0.5t2 + 0.5t2 = 0.0
15 + -6t + 0.5t2 = 0.0

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

Divide each side by '0.5'.
30 + -12t + t2 = 0

Move the constant term to the right:

Add '-30' to each side of the equation.
30 + -12t + -30 + t2 = 0 + -30

Reorder the terms:
30 + -30 + -12t + t2 = 0 + -30

Combine like terms: 30 + -30 = 0
0 + -12t + t2 = 0 + -30
-12t + t2 = 0 + -30

Combine like terms: 0 + -30 = -30
-12t + t2 = -30

The t term is -12t.  Take half its coefficient (-6).
Square it (36) and add it to both sides.

Add '36' to each side of the equation.
-12t + 36 + t2 = -30 + 36

Reorder the terms:
36 + -12t + t2 = -30 + 36

Combine like terms: -30 + 36 = 6
36 + -12t + t2 = 6

Factor a perfect square on the left side:
(t + -6)(t + -6) = 6

Calculate the square root of the right side: 2.449489743

Break this problem into two subproblems by setting 
(t + -6) equal to 2.449489743 and -2.449489743.

Subproblem 1

t + -6 = 2.449489743 Simplifying t + -6 = 2.449489743 Reorder the terms: -6 + t = 2.449489743 Solving -6 + t = 2.449489743 Solving for variable 't'. Move all terms containing t to the left, all other terms to the right. Add '6' to each side of the equation. -6 + 6 + t = 2.449489743 + 6 Combine like terms: -6 + 6 = 0 0 + t = 2.449489743 + 6 t = 2.449489743 + 6 Combine like terms: 2.449489743 + 6 = 8.449489743 t = 8.449489743 Simplifying t = 8.449489743

Subproblem 2

t + -6 = -2.449489743 Simplifying t + -6 = -2.449489743 Reorder the terms: -6 + t = -2.449489743 Solving -6 + t = -2.449489743 Solving for variable 't'. Move all terms containing t to the left, all other terms to the right. Add '6' to each side of the equation. -6 + 6 + t = -2.449489743 + 6 Combine like terms: -6 + 6 = 0 0 + t = -2.449489743 + 6 t = -2.449489743 + 6 Combine like terms: -2.449489743 + 6 = 3.550510257 t = 3.550510257 Simplifying t = 3.550510257

Solution

The solution to the problem is based on the solutions from the subproblems. t = {8.449489743, 3.550510257}

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