10t=-.8t^2+1.6t+12

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Solution for 10t=-.8t^2+1.6t+12 equation:


Simplifying
10t = -0.8t2 + 1.6t + 12

Reorder the terms:
10t = 12 + 1.6t + -0.8t2

Solving
10t = 12 + 1.6t + -0.8t2

Solving for variable 't'.

Reorder the terms:
-12 + 10t + -1.6t + 0.8t2 = 12 + 1.6t + -0.8t2 + -12 + -1.6t + 0.8t2

Combine like terms: 10t + -1.6t = 8.4t
-12 + 8.4t + 0.8t2 = 12 + 1.6t + -0.8t2 + -12 + -1.6t + 0.8t2

Reorder the terms:
-12 + 8.4t + 0.8t2 = 12 + -12 + 1.6t + -1.6t + -0.8t2 + 0.8t2

Combine like terms: 12 + -12 = 0
-12 + 8.4t + 0.8t2 = 0 + 1.6t + -1.6t + -0.8t2 + 0.8t2
-12 + 8.4t + 0.8t2 = 1.6t + -1.6t + -0.8t2 + 0.8t2

Combine like terms: 1.6t + -1.6t = 0.0
-12 + 8.4t + 0.8t2 = 0.0 + -0.8t2 + 0.8t2
-12 + 8.4t + 0.8t2 = -0.8t2 + 0.8t2

Combine like terms: -0.8t2 + 0.8t2 = 0.0
-12 + 8.4t + 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'.
-15 + 10.5t + t2 = 0

Move the constant term to the right:

Add '15' to each side of the equation.
-15 + 10.5t + 15 + t2 = 0 + 15

Reorder the terms:
-15 + 15 + 10.5t + t2 = 0 + 15

Combine like terms: -15 + 15 = 0
0 + 10.5t + t2 = 0 + 15
10.5t + t2 = 0 + 15

Combine like terms: 0 + 15 = 15
10.5t + t2 = 15

The t term is 10.5t.  Take half its coefficient (5.25).
Square it (27.5625) and add it to both sides.

Add '27.5625' to each side of the equation.
10.5t + 27.5625 + t2 = 15 + 27.5625

Reorder the terms:
27.5625 + 10.5t + t2 = 15 + 27.5625

Combine like terms: 15 + 27.5625 = 42.5625
27.5625 + 10.5t + t2 = 42.5625

Factor a perfect square on the left side:
(t + 5.25)(t + 5.25) = 42.5625

Calculate the square root of the right side: 6.523994175

Break this problem into two subproblems by setting 
(t + 5.25) equal to 6.523994175 and -6.523994175.

Subproblem 1

t + 5.25 = 6.523994175 Simplifying t + 5.25 = 6.523994175 Reorder the terms: 5.25 + t = 6.523994175 Solving 5.25 + t = 6.523994175 Solving for variable 't'. Move all terms containing t to the left, all other terms to the right. Add '-5.25' to each side of the equation. 5.25 + -5.25 + t = 6.523994175 + -5.25 Combine like terms: 5.25 + -5.25 = 0.00 0.00 + t = 6.523994175 + -5.25 t = 6.523994175 + -5.25 Combine like terms: 6.523994175 + -5.25 = 1.273994175 t = 1.273994175 Simplifying t = 1.273994175

Subproblem 2

t + 5.25 = -6.523994175 Simplifying t + 5.25 = -6.523994175 Reorder the terms: 5.25 + t = -6.523994175 Solving 5.25 + t = -6.523994175 Solving for variable 't'. Move all terms containing t to the left, all other terms to the right. Add '-5.25' to each side of the equation. 5.25 + -5.25 + t = -6.523994175 + -5.25 Combine like terms: 5.25 + -5.25 = 0.00 0.00 + t = -6.523994175 + -5.25 t = -6.523994175 + -5.25 Combine like terms: -6.523994175 + -5.25 = -11.773994175 t = -11.773994175 Simplifying t = -11.773994175

Solution

The solution to the problem is based on the solutions from the subproblems. t = {1.273994175, -11.773994175}

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