85=195t-16t^2

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Solution for 85=195t-16t^2 equation:


Simplifying
85 = 195t + -16t2

Solving
85 = 195t + -16t2

Solving for variable 't'.

Reorder the terms:
85 + -195t + 16t2 = 195t + -195t + -16t2 + 16t2

Combine like terms: 195t + -195t = 0
85 + -195t + 16t2 = 0 + -16t2 + 16t2
85 + -195t + 16t2 = -16t2 + 16t2

Combine like terms: -16t2 + 16t2 = 0
85 + -195t + 16t2 = 0

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

Divide each side by '16'.
5.3125 + -12.1875t + t2 = 0

Move the constant term to the right:

Add '-5.3125' to each side of the equation.
5.3125 + -12.1875t + -5.3125 + t2 = 0 + -5.3125

Reorder the terms:
5.3125 + -5.3125 + -12.1875t + t2 = 0 + -5.3125

Combine like terms: 5.3125 + -5.3125 = 0.0000
0.0000 + -12.1875t + t2 = 0 + -5.3125
-12.1875t + t2 = 0 + -5.3125

Combine like terms: 0 + -5.3125 = -5.3125
-12.1875t + t2 = -5.3125

The t term is -12.1875t.  Take half its coefficient (-6.09375).
Square it (37.13378906) and add it to both sides.

Add '37.13378906' to each side of the equation.
-12.1875t + 37.13378906 + t2 = -5.3125 + 37.13378906

Reorder the terms:
37.13378906 + -12.1875t + t2 = -5.3125 + 37.13378906

Combine like terms: -5.3125 + 37.13378906 = 31.82128906
37.13378906 + -12.1875t + t2 = 31.82128906

Factor a perfect square on the left side:
(t + -6.09375)(t + -6.09375) = 31.82128906

Calculate the square root of the right side: 5.641036169

Break this problem into two subproblems by setting 
(t + -6.09375) equal to 5.641036169 and -5.641036169.

Subproblem 1

t + -6.09375 = 5.641036169 Simplifying t + -6.09375 = 5.641036169 Reorder the terms: -6.09375 + t = 5.641036169 Solving -6.09375 + t = 5.641036169 Solving for variable 't'. Move all terms containing t to the left, all other terms to the right. Add '6.09375' to each side of the equation. -6.09375 + 6.09375 + t = 5.641036169 + 6.09375 Combine like terms: -6.09375 + 6.09375 = 0.00000 0.00000 + t = 5.641036169 + 6.09375 t = 5.641036169 + 6.09375 Combine like terms: 5.641036169 + 6.09375 = 11.734786169 t = 11.734786169 Simplifying t = 11.734786169

Subproblem 2

t + -6.09375 = -5.641036169 Simplifying t + -6.09375 = -5.641036169 Reorder the terms: -6.09375 + t = -5.641036169 Solving -6.09375 + t = -5.641036169 Solving for variable 't'. Move all terms containing t to the left, all other terms to the right. Add '6.09375' to each side of the equation. -6.09375 + 6.09375 + t = -5.641036169 + 6.09375 Combine like terms: -6.09375 + 6.09375 = 0.00000 0.00000 + t = -5.641036169 + 6.09375 t = -5.641036169 + 6.09375 Combine like terms: -5.641036169 + 6.09375 = 0.452713831 t = 0.452713831 Simplifying t = 0.452713831

Solution

The solution to the problem is based on the solutions from the subproblems. t = {11.734786169, 0.452713831}

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