0=-16t^2+75t+100

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Solution for 0=-16t^2+75t+100 equation:


Simplifying
0 = -16t2 + 75t + 100

Reorder the terms:
0 = 100 + 75t + -16t2

Solving
0 = 100 + 75t + -16t2

Solving for variable 't'.

Combine like terms: 0 + -100 = -100
-100 + -75t + 16t2 = 100 + 75t + -16t2 + -100 + -75t + 16t2

Reorder the terms:
-100 + -75t + 16t2 = 100 + -100 + 75t + -75t + -16t2 + 16t2

Combine like terms: 100 + -100 = 0
-100 + -75t + 16t2 = 0 + 75t + -75t + -16t2 + 16t2
-100 + -75t + 16t2 = 75t + -75t + -16t2 + 16t2

Combine like terms: 75t + -75t = 0
-100 + -75t + 16t2 = 0 + -16t2 + 16t2
-100 + -75t + 16t2 = -16t2 + 16t2

Combine like terms: -16t2 + 16t2 = 0
-100 + -75t + 16t2 = 0

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

Divide each side by '16'.
-6.25 + -4.6875t + t2 = 0

Move the constant term to the right:

Add '6.25' to each side of the equation.
-6.25 + -4.6875t + 6.25 + t2 = 0 + 6.25

Reorder the terms:
-6.25 + 6.25 + -4.6875t + t2 = 0 + 6.25

Combine like terms: -6.25 + 6.25 = 0.00
0.00 + -4.6875t + t2 = 0 + 6.25
-4.6875t + t2 = 0 + 6.25

Combine like terms: 0 + 6.25 = 6.25
-4.6875t + t2 = 6.25

The t term is -4.6875t.  Take half its coefficient (-2.34375).
Square it (5.493164063) and add it to both sides.

Add '5.493164063' to each side of the equation.
-4.6875t + 5.493164063 + t2 = 6.25 + 5.493164063

Reorder the terms:
5.493164063 + -4.6875t + t2 = 6.25 + 5.493164063

Combine like terms: 6.25 + 5.493164063 = 11.743164063
5.493164063 + -4.6875t + t2 = 11.743164063

Factor a perfect square on the left side:
(t + -2.34375)(t + -2.34375) = 11.743164063

Calculate the square root of the right side: 3.426830031

Break this problem into two subproblems by setting 
(t + -2.34375) equal to 3.426830031 and -3.426830031.

Subproblem 1

t + -2.34375 = 3.426830031 Simplifying t + -2.34375 = 3.426830031 Reorder the terms: -2.34375 + t = 3.426830031 Solving -2.34375 + t = 3.426830031 Solving for variable 't'. Move all terms containing t to the left, all other terms to the right. Add '2.34375' to each side of the equation. -2.34375 + 2.34375 + t = 3.426830031 + 2.34375 Combine like terms: -2.34375 + 2.34375 = 0.00000 0.00000 + t = 3.426830031 + 2.34375 t = 3.426830031 + 2.34375 Combine like terms: 3.426830031 + 2.34375 = 5.770580031 t = 5.770580031 Simplifying t = 5.770580031

Subproblem 2

t + -2.34375 = -3.426830031 Simplifying t + -2.34375 = -3.426830031 Reorder the terms: -2.34375 + t = -3.426830031 Solving -2.34375 + t = -3.426830031 Solving for variable 't'. Move all terms containing t to the left, all other terms to the right. Add '2.34375' to each side of the equation. -2.34375 + 2.34375 + t = -3.426830031 + 2.34375 Combine like terms: -2.34375 + 2.34375 = 0.00000 0.00000 + t = -3.426830031 + 2.34375 t = -3.426830031 + 2.34375 Combine like terms: -3.426830031 + 2.34375 = -1.083080031 t = -1.083080031 Simplifying t = -1.083080031

Solution

The solution to the problem is based on the solutions from the subproblems. t = {5.770580031, -1.083080031}

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