129=-16t^2+129t

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Solution for 129=-16t^2+129t equation:


Simplifying
129 = -16t2 + 129t

Reorder the terms:
129 = 129t + -16t2

Solving
129 = 129t + -16t2

Solving for variable 't'.

Reorder the terms:
129 + -129t + 16t2 = 129t + -129t + -16t2 + 16t2

Combine like terms: 129t + -129t = 0
129 + -129t + 16t2 = 0 + -16t2 + 16t2
129 + -129t + 16t2 = -16t2 + 16t2

Combine like terms: -16t2 + 16t2 = 0
129 + -129t + 16t2 = 0

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

Divide each side by '16'.
8.0625 + -8.0625t + t2 = 0

Move the constant term to the right:

Add '-8.0625' to each side of the equation.
8.0625 + -8.0625t + -8.0625 + t2 = 0 + -8.0625

Reorder the terms:
8.0625 + -8.0625 + -8.0625t + t2 = 0 + -8.0625

Combine like terms: 8.0625 + -8.0625 = 0.0000
0.0000 + -8.0625t + t2 = 0 + -8.0625
-8.0625t + t2 = 0 + -8.0625

Combine like terms: 0 + -8.0625 = -8.0625
-8.0625t + t2 = -8.0625

The t term is -8.0625t.  Take half its coefficient (-4.03125).
Square it (16.25097656) and add it to both sides.

Add '16.25097656' to each side of the equation.
-8.0625t + 16.25097656 + t2 = -8.0625 + 16.25097656

Reorder the terms:
16.25097656 + -8.0625t + t2 = -8.0625 + 16.25097656

Combine like terms: -8.0625 + 16.25097656 = 8.18847656
16.25097656 + -8.0625t + t2 = 8.18847656

Factor a perfect square on the left side:
(t + -4.03125)(t + -4.03125) = 8.18847656

Calculate the square root of the right side: 2.861551425

Break this problem into two subproblems by setting 
(t + -4.03125) equal to 2.861551425 and -2.861551425.

Subproblem 1

t + -4.03125 = 2.861551425 Simplifying t + -4.03125 = 2.861551425 Reorder the terms: -4.03125 + t = 2.861551425 Solving -4.03125 + t = 2.861551425 Solving for variable 't'. Move all terms containing t to the left, all other terms to the right. Add '4.03125' to each side of the equation. -4.03125 + 4.03125 + t = 2.861551425 + 4.03125 Combine like terms: -4.03125 + 4.03125 = 0.00000 0.00000 + t = 2.861551425 + 4.03125 t = 2.861551425 + 4.03125 Combine like terms: 2.861551425 + 4.03125 = 6.892801425 t = 6.892801425 Simplifying t = 6.892801425

Subproblem 2

t + -4.03125 = -2.861551425 Simplifying t + -4.03125 = -2.861551425 Reorder the terms: -4.03125 + t = -2.861551425 Solving -4.03125 + t = -2.861551425 Solving for variable 't'. Move all terms containing t to the left, all other terms to the right. Add '4.03125' to each side of the equation. -4.03125 + 4.03125 + t = -2.861551425 + 4.03125 Combine like terms: -4.03125 + 4.03125 = 0.00000 0.00000 + t = -2.861551425 + 4.03125 t = -2.861551425 + 4.03125 Combine like terms: -2.861551425 + 4.03125 = 1.169698575 t = 1.169698575 Simplifying t = 1.169698575

Solution

The solution to the problem is based on the solutions from the subproblems. t = {6.892801425, 1.169698575}

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