10=8t-.8t^2

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Solution for 10=8t-.8t^2 equation:


Simplifying
10 = 8t + -0.8t2

Solving
10 = 8t + -0.8t2

Solving for variable 't'.

Reorder the terms:
10 + -8t + 0.8t2 = 8t + -8t + -0.8t2 + 0.8t2

Combine like terms: 8t + -8t = 0
10 + -8t + 0.8t2 = 0 + -0.8t2 + 0.8t2
10 + -8t + 0.8t2 = -0.8t2 + 0.8t2

Combine like terms: -0.8t2 + 0.8t2 = 0.0
10 + -8t + 0.8t2 = 0.0

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

Divide each side by '0.8'.
12.5 + -10t + t2 = 0

Move the constant term to the right:

Add '-12.5' to each side of the equation.
12.5 + -10t + -12.5 + t2 = 0 + -12.5

Reorder the terms:
12.5 + -12.5 + -10t + t2 = 0 + -12.5

Combine like terms: 12.5 + -12.5 = 0.0
0.0 + -10t + t2 = 0 + -12.5
-10t + t2 = 0 + -12.5

Combine like terms: 0 + -12.5 = -12.5
-10t + t2 = -12.5

The t term is -10t.  Take half its coefficient (-5).
Square it (25) and add it to both sides.

Add '25' to each side of the equation.
-10t + 25 + t2 = -12.5 + 25

Reorder the terms:
25 + -10t + t2 = -12.5 + 25

Combine like terms: -12.5 + 25 = 12.5
25 + -10t + t2 = 12.5

Factor a perfect square on the left side:
(t + -5)(t + -5) = 12.5

Calculate the square root of the right side: 3.535533906

Break this problem into two subproblems by setting 
(t + -5) equal to 3.535533906 and -3.535533906.

Subproblem 1

t + -5 = 3.535533906 Simplifying t + -5 = 3.535533906 Reorder the terms: -5 + t = 3.535533906 Solving -5 + t = 3.535533906 Solving for variable 't'. Move all terms containing t to the left, all other terms to the right. Add '5' to each side of the equation. -5 + 5 + t = 3.535533906 + 5 Combine like terms: -5 + 5 = 0 0 + t = 3.535533906 + 5 t = 3.535533906 + 5 Combine like terms: 3.535533906 + 5 = 8.535533906 t = 8.535533906 Simplifying t = 8.535533906

Subproblem 2

t + -5 = -3.535533906 Simplifying t + -5 = -3.535533906 Reorder the terms: -5 + t = -3.535533906 Solving -5 + t = -3.535533906 Solving for variable 't'. Move all terms containing t to the left, all other terms to the right. Add '5' to each side of the equation. -5 + 5 + t = -3.535533906 + 5 Combine like terms: -5 + 5 = 0 0 + t = -3.535533906 + 5 t = -3.535533906 + 5 Combine like terms: -3.535533906 + 5 = 1.464466094 t = 1.464466094 Simplifying t = 1.464466094

Solution

The solution to the problem is based on the solutions from the subproblems. t = {8.535533906, 1.464466094}

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