0=-16t^2+138t+105

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Solution for 0=-16t^2+138t+105 equation:


Simplifying
0 = -16t2 + 138t + 105

Reorder the terms:
0 = 105 + 138t + -16t2

Solving
0 = 105 + 138t + -16t2

Solving for variable 't'.

Combine like terms: 0 + -105 = -105
-105 + -138t + 16t2 = 105 + 138t + -16t2 + -105 + -138t + 16t2

Reorder the terms:
-105 + -138t + 16t2 = 105 + -105 + 138t + -138t + -16t2 + 16t2

Combine like terms: 105 + -105 = 0
-105 + -138t + 16t2 = 0 + 138t + -138t + -16t2 + 16t2
-105 + -138t + 16t2 = 138t + -138t + -16t2 + 16t2

Combine like terms: 138t + -138t = 0
-105 + -138t + 16t2 = 0 + -16t2 + 16t2
-105 + -138t + 16t2 = -16t2 + 16t2

Combine like terms: -16t2 + 16t2 = 0
-105 + -138t + 16t2 = 0

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

Divide each side by '16'.
-6.5625 + -8.625t + t2 = 0

Move the constant term to the right:

Add '6.5625' to each side of the equation.
-6.5625 + -8.625t + 6.5625 + t2 = 0 + 6.5625

Reorder the terms:
-6.5625 + 6.5625 + -8.625t + t2 = 0 + 6.5625

Combine like terms: -6.5625 + 6.5625 = 0.0000
0.0000 + -8.625t + t2 = 0 + 6.5625
-8.625t + t2 = 0 + 6.5625

Combine like terms: 0 + 6.5625 = 6.5625
-8.625t + t2 = 6.5625

The t term is -8.625t.  Take half its coefficient (-4.3125).
Square it (18.59765625) and add it to both sides.

Add '18.59765625' to each side of the equation.
-8.625t + 18.59765625 + t2 = 6.5625 + 18.59765625

Reorder the terms:
18.59765625 + -8.625t + t2 = 6.5625 + 18.59765625

Combine like terms: 6.5625 + 18.59765625 = 25.16015625
18.59765625 + -8.625t + t2 = 25.16015625

Factor a perfect square on the left side:
(t + -4.3125)(t + -4.3125) = 25.16015625

Calculate the square root of the right side: 5.015990057

Break this problem into two subproblems by setting 
(t + -4.3125) equal to 5.015990057 and -5.015990057.

Subproblem 1

t + -4.3125 = 5.015990057 Simplifying t + -4.3125 = 5.015990057 Reorder the terms: -4.3125 + t = 5.015990057 Solving -4.3125 + t = 5.015990057 Solving for variable 't'. Move all terms containing t to the left, all other terms to the right. Add '4.3125' to each side of the equation. -4.3125 + 4.3125 + t = 5.015990057 + 4.3125 Combine like terms: -4.3125 + 4.3125 = 0.0000 0.0000 + t = 5.015990057 + 4.3125 t = 5.015990057 + 4.3125 Combine like terms: 5.015990057 + 4.3125 = 9.328490057 t = 9.328490057 Simplifying t = 9.328490057

Subproblem 2

t + -4.3125 = -5.015990057 Simplifying t + -4.3125 = -5.015990057 Reorder the terms: -4.3125 + t = -5.015990057 Solving -4.3125 + t = -5.015990057 Solving for variable 't'. Move all terms containing t to the left, all other terms to the right. Add '4.3125' to each side of the equation. -4.3125 + 4.3125 + t = -5.015990057 + 4.3125 Combine like terms: -4.3125 + 4.3125 = 0.0000 0.0000 + t = -5.015990057 + 4.3125 t = -5.015990057 + 4.3125 Combine like terms: -5.015990057 + 4.3125 = -0.703490057 t = -0.703490057 Simplifying t = -0.703490057

Solution

The solution to the problem is based on the solutions from the subproblems. t = {9.328490057, -0.703490057}

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