128=-16t^2+128t+5

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Solution for 128=-16t^2+128t+5 equation:


Simplifying
128 = -16t2 + 128t + 5

Reorder the terms:
128 = 5 + 128t + -16t2

Solving
128 = 5 + 128t + -16t2

Solving for variable 't'.

Combine like terms: 128 + -5 = 123
123 + -128t + 16t2 = 5 + 128t + -16t2 + -5 + -128t + 16t2

Reorder the terms:
123 + -128t + 16t2 = 5 + -5 + 128t + -128t + -16t2 + 16t2

Combine like terms: 5 + -5 = 0
123 + -128t + 16t2 = 0 + 128t + -128t + -16t2 + 16t2
123 + -128t + 16t2 = 128t + -128t + -16t2 + 16t2

Combine like terms: 128t + -128t = 0
123 + -128t + 16t2 = 0 + -16t2 + 16t2
123 + -128t + 16t2 = -16t2 + 16t2

Combine like terms: -16t2 + 16t2 = 0
123 + -128t + 16t2 = 0

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

Divide each side by '16'.
7.6875 + -8t + t2 = 0

Move the constant term to the right:

Add '-7.6875' to each side of the equation.
7.6875 + -8t + -7.6875 + t2 = 0 + -7.6875

Reorder the terms:
7.6875 + -7.6875 + -8t + t2 = 0 + -7.6875

Combine like terms: 7.6875 + -7.6875 = 0.0000
0.0000 + -8t + t2 = 0 + -7.6875
-8t + t2 = 0 + -7.6875

Combine like terms: 0 + -7.6875 = -7.6875
-8t + t2 = -7.6875

The t term is -8t.  Take half its coefficient (-4).
Square it (16) and add it to both sides.

Add '16' to each side of the equation.
-8t + 16 + t2 = -7.6875 + 16

Reorder the terms:
16 + -8t + t2 = -7.6875 + 16

Combine like terms: -7.6875 + 16 = 8.3125
16 + -8t + t2 = 8.3125

Factor a perfect square on the left side:
(t + -4)(t + -4) = 8.3125

Calculate the square root of the right side: 2.883140649

Break this problem into two subproblems by setting 
(t + -4) equal to 2.883140649 and -2.883140649.

Subproblem 1

t + -4 = 2.883140649 Simplifying t + -4 = 2.883140649 Reorder the terms: -4 + t = 2.883140649 Solving -4 + t = 2.883140649 Solving for variable 't'. Move all terms containing t to the left, all other terms to the right. Add '4' to each side of the equation. -4 + 4 + t = 2.883140649 + 4 Combine like terms: -4 + 4 = 0 0 + t = 2.883140649 + 4 t = 2.883140649 + 4 Combine like terms: 2.883140649 + 4 = 6.883140649 t = 6.883140649 Simplifying t = 6.883140649

Subproblem 2

t + -4 = -2.883140649 Simplifying t + -4 = -2.883140649 Reorder the terms: -4 + t = -2.883140649 Solving -4 + t = -2.883140649 Solving for variable 't'. Move all terms containing t to the left, all other terms to the right. Add '4' to each side of the equation. -4 + 4 + t = -2.883140649 + 4 Combine like terms: -4 + 4 = 0 0 + t = -2.883140649 + 4 t = -2.883140649 + 4 Combine like terms: -2.883140649 + 4 = 1.116859351 t = 1.116859351 Simplifying t = 1.116859351

Solution

The solution to the problem is based on the solutions from the subproblems. t = {6.883140649, 1.116859351}

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