85=125t-16t^2

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Solution for 85=125t-16t^2 equation:


Simplifying
85 = 125t + -16t2

Solving
85 = 125t + -16t2

Solving for variable 't'.

Reorder the terms:
85 + -125t + 16t2 = 125t + -125t + -16t2 + 16t2

Combine like terms: 125t + -125t = 0
85 + -125t + 16t2 = 0 + -16t2 + 16t2
85 + -125t + 16t2 = -16t2 + 16t2

Combine like terms: -16t2 + 16t2 = 0
85 + -125t + 16t2 = 0

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

Divide each side by '16'.
5.3125 + -7.8125t + t2 = 0

Move the constant term to the right:

Add '-5.3125' to each side of the equation.
5.3125 + -7.8125t + -5.3125 + t2 = 0 + -5.3125

Reorder the terms:
5.3125 + -5.3125 + -7.8125t + t2 = 0 + -5.3125

Combine like terms: 5.3125 + -5.3125 = 0.0000
0.0000 + -7.8125t + t2 = 0 + -5.3125
-7.8125t + t2 = 0 + -5.3125

Combine like terms: 0 + -5.3125 = -5.3125
-7.8125t + t2 = -5.3125

The t term is -7.8125t.  Take half its coefficient (-3.90625).
Square it (15.25878906) and add it to both sides.

Add '15.25878906' to each side of the equation.
-7.8125t + 15.25878906 + t2 = -5.3125 + 15.25878906

Reorder the terms:
15.25878906 + -7.8125t + t2 = -5.3125 + 15.25878906

Combine like terms: -5.3125 + 15.25878906 = 9.94628906
15.25878906 + -7.8125t + t2 = 9.94628906

Factor a perfect square on the left side:
(t + -3.90625)(t + -3.90625) = 9.94628906

Calculate the square root of the right side: 3.153773781

Break this problem into two subproblems by setting 
(t + -3.90625) equal to 3.153773781 and -3.153773781.

Subproblem 1

t + -3.90625 = 3.153773781 Simplifying t + -3.90625 = 3.153773781 Reorder the terms: -3.90625 + t = 3.153773781 Solving -3.90625 + t = 3.153773781 Solving for variable 't'. Move all terms containing t to the left, all other terms to the right. Add '3.90625' to each side of the equation. -3.90625 + 3.90625 + t = 3.153773781 + 3.90625 Combine like terms: -3.90625 + 3.90625 = 0.00000 0.00000 + t = 3.153773781 + 3.90625 t = 3.153773781 + 3.90625 Combine like terms: 3.153773781 + 3.90625 = 7.060023781 t = 7.060023781 Simplifying t = 7.060023781

Subproblem 2

t + -3.90625 = -3.153773781 Simplifying t + -3.90625 = -3.153773781 Reorder the terms: -3.90625 + t = -3.153773781 Solving -3.90625 + t = -3.153773781 Solving for variable 't'. Move all terms containing t to the left, all other terms to the right. Add '3.90625' to each side of the equation. -3.90625 + 3.90625 + t = -3.153773781 + 3.90625 Combine like terms: -3.90625 + 3.90625 = 0.00000 0.00000 + t = -3.153773781 + 3.90625 t = -3.153773781 + 3.90625 Combine like terms: -3.153773781 + 3.90625 = 0.752476219 t = 0.752476219 Simplifying t = 0.752476219

Solution

The solution to the problem is based on the solutions from the subproblems. t = {7.060023781, 0.752476219}

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