4=-16t^2+125t

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


Simplifying
4 = -16t2 + 125t

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

Solving
4 = 125t + -16t2

Solving for variable 't'.

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

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

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

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

Divide each side by '16'.
0.25 + -7.8125t + t2 = 0

Move the constant term to the right:

Add '-0.25' to each side of the equation.
0.25 + -7.8125t + -0.25 + t2 = 0 + -0.25

Reorder the terms:
0.25 + -0.25 + -7.8125t + t2 = 0 + -0.25

Combine like terms: 0.25 + -0.25 = 0.00
0.00 + -7.8125t + t2 = 0 + -0.25
-7.8125t + t2 = 0 + -0.25

Combine like terms: 0 + -0.25 = -0.25
-7.8125t + t2 = -0.25

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 = -0.25 + 15.25878906

Reorder the terms:
15.25878906 + -7.8125t + t2 = -0.25 + 15.25878906

Combine like terms: -0.25 + 15.25878906 = 15.00878906
15.25878906 + -7.8125t + t2 = 15.00878906

Factor a perfect square on the left side:
(t + -3.90625)(t + -3.90625) = 15.00878906

Calculate the square root of the right side: 3.874117843

Break this problem into two subproblems by setting 
(t + -3.90625) equal to 3.874117843 and -3.874117843.

Subproblem 1

t + -3.90625 = 3.874117843 Simplifying t + -3.90625 = 3.874117843 Reorder the terms: -3.90625 + t = 3.874117843 Solving -3.90625 + t = 3.874117843 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 = 3.874117843 + 3.90625 Combine like terms: -3.90625 + 3.90625 = 0.00000 0.00000 + t = 3.874117843 + 3.90625 t = 3.874117843 + 3.90625 Combine like terms: 3.874117843 + 3.90625 = 7.780367843 t = 7.780367843 Simplifying t = 7.780367843

Subproblem 2

t + -3.90625 = -3.874117843 Simplifying t + -3.90625 = -3.874117843 Reorder the terms: -3.90625 + t = -3.874117843 Solving -3.90625 + t = -3.874117843 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 = -3.874117843 + 3.90625 Combine like terms: -3.90625 + 3.90625 = 0.00000 0.00000 + t = -3.874117843 + 3.90625 t = -3.874117843 + 3.90625 Combine like terms: -3.874117843 + 3.90625 = 0.032132157 t = 0.032132157 Simplifying t = 0.032132157

Solution

The solution to the problem is based on the solutions from the subproblems. t = {7.780367843, 0.032132157}

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