0=20+6t-t^2

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Solution for 0=20+6t-t^2 equation:


Simplifying
0 = 20 + 6t + -1t2

Solving
0 = 20 + 6t + -1t2

Solving for variable 't'.

Combine like terms: 0 + -20 = -20
-20 + -6t + t2 = 20 + 6t + -1t2 + -20 + -6t + t2

Reorder the terms:
-20 + -6t + t2 = 20 + -20 + 6t + -6t + -1t2 + t2

Combine like terms: 20 + -20 = 0
-20 + -6t + t2 = 0 + 6t + -6t + -1t2 + t2
-20 + -6t + t2 = 6t + -6t + -1t2 + t2

Combine like terms: 6t + -6t = 0
-20 + -6t + t2 = 0 + -1t2 + t2
-20 + -6t + t2 = -1t2 + t2

Combine like terms: -1t2 + t2 = 0
-20 + -6t + t2 = 0

Begin completing the square.

Move the constant term to the right:

Add '20' to each side of the equation.
-20 + -6t + 20 + t2 = 0 + 20

Reorder the terms:
-20 + 20 + -6t + t2 = 0 + 20

Combine like terms: -20 + 20 = 0
0 + -6t + t2 = 0 + 20
-6t + t2 = 0 + 20

Combine like terms: 0 + 20 = 20
-6t + t2 = 20

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 = 20 + 9

Reorder the terms:
9 + -6t + t2 = 20 + 9

Combine like terms: 20 + 9 = 29
9 + -6t + t2 = 29

Factor a perfect square on the left side:
(t + -3)(t + -3) = 29

Calculate the square root of the right side: 5.385164807

Break this problem into two subproblems by setting 
(t + -3) equal to 5.385164807 and -5.385164807.

Subproblem 1

t + -3 = 5.385164807 Simplifying t + -3 = 5.385164807 Reorder the terms: -3 + t = 5.385164807 Solving -3 + t = 5.385164807 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 = 5.385164807 + 3 Combine like terms: -3 + 3 = 0 0 + t = 5.385164807 + 3 t = 5.385164807 + 3 Combine like terms: 5.385164807 + 3 = 8.385164807 t = 8.385164807 Simplifying t = 8.385164807

Subproblem 2

t + -3 = -5.385164807 Simplifying t + -3 = -5.385164807 Reorder the terms: -3 + t = -5.385164807 Solving -3 + t = -5.385164807 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 = -5.385164807 + 3 Combine like terms: -3 + 3 = 0 0 + t = -5.385164807 + 3 t = -5.385164807 + 3 Combine like terms: -5.385164807 + 3 = -2.385164807 t = -2.385164807 Simplifying t = -2.385164807

Solution

The solution to the problem is based on the solutions from the subproblems. t = {8.385164807, -2.385164807}

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