125=-16t^2+125t+4

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Solution for 125=-16t^2+125t+4 equation:


Simplifying
125 = -16t2 + 125t + 4

Reorder the terms:
125 = 4 + 125t + -16t2

Solving
125 = 4 + 125t + -16t2

Solving for variable 't'.

Combine like terms: 125 + -4 = 121
121 + -125t + 16t2 = 4 + 125t + -16t2 + -4 + -125t + 16t2

Reorder the terms:
121 + -125t + 16t2 = 4 + -4 + 125t + -125t + -16t2 + 16t2

Combine like terms: 4 + -4 = 0
121 + -125t + 16t2 = 0 + 125t + -125t + -16t2 + 16t2
121 + -125t + 16t2 = 125t + -125t + -16t2 + 16t2

Combine like terms: 125t + -125t = 0
121 + -125t + 16t2 = 0 + -16t2 + 16t2
121 + -125t + 16t2 = -16t2 + 16t2

Combine like terms: -16t2 + 16t2 = 0
121 + -125t + 16t2 = 0

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

Divide each side by '16'.
7.5625 + -7.8125t + t2 = 0

Move the constant term to the right:

Add '-7.5625' to each side of the equation.
7.5625 + -7.8125t + -7.5625 + t2 = 0 + -7.5625

Reorder the terms:
7.5625 + -7.5625 + -7.8125t + t2 = 0 + -7.5625

Combine like terms: 7.5625 + -7.5625 = 0.0000
0.0000 + -7.8125t + t2 = 0 + -7.5625
-7.8125t + t2 = 0 + -7.5625

Combine like terms: 0 + -7.5625 = -7.5625
-7.8125t + t2 = -7.5625

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 = -7.5625 + 15.25878906

Reorder the terms:
15.25878906 + -7.8125t + t2 = -7.5625 + 15.25878906

Combine like terms: -7.5625 + 15.25878906 = 7.69628906
15.25878906 + -7.8125t + t2 = 7.69628906

Factor a perfect square on the left side:
(t + -3.90625)(t + -3.90625) = 7.69628906

Calculate the square root of the right side: 2.77421864

Break this problem into two subproblems by setting 
(t + -3.90625) equal to 2.77421864 and -2.77421864.

Subproblem 1

t + -3.90625 = 2.77421864 Simplifying t + -3.90625 = 2.77421864 Reorder the terms: -3.90625 + t = 2.77421864 Solving -3.90625 + t = 2.77421864 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 = 2.77421864 + 3.90625 Combine like terms: -3.90625 + 3.90625 = 0.00000 0.00000 + t = 2.77421864 + 3.90625 t = 2.77421864 + 3.90625 Combine like terms: 2.77421864 + 3.90625 = 6.68046864 t = 6.68046864 Simplifying t = 6.68046864

Subproblem 2

t + -3.90625 = -2.77421864 Simplifying t + -3.90625 = -2.77421864 Reorder the terms: -3.90625 + t = -2.77421864 Solving -3.90625 + t = -2.77421864 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 = -2.77421864 + 3.90625 Combine like terms: -3.90625 + 3.90625 = 0.00000 0.00000 + t = -2.77421864 + 3.90625 t = -2.77421864 + 3.90625 Combine like terms: -2.77421864 + 3.90625 = 1.13203136 t = 1.13203136 Simplifying t = 1.13203136

Solution

The solution to the problem is based on the solutions from the subproblems. t = {6.68046864, 1.13203136}

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