0=-16t^2+40t+6.5

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Solution for 0=-16t^2+40t+6.5 equation:


Simplifying
0 = -16t2 + 40t + 6.5

Reorder the terms:
0 = 6.5 + 40t + -16t2

Solving
0 = 6.5 + 40t + -16t2

Solving for variable 't'.

Combine like terms: 0 + -6.5 = -6.5
-6.5 + -40t + 16t2 = 6.5 + 40t + -16t2 + -6.5 + -40t + 16t2

Reorder the terms:
-6.5 + -40t + 16t2 = 6.5 + -6.5 + 40t + -40t + -16t2 + 16t2

Combine like terms: 6.5 + -6.5 = 0.0
-6.5 + -40t + 16t2 = 0.0 + 40t + -40t + -16t2 + 16t2
-6.5 + -40t + 16t2 = 40t + -40t + -16t2 + 16t2

Combine like terms: 40t + -40t = 0
-6.5 + -40t + 16t2 = 0 + -16t2 + 16t2
-6.5 + -40t + 16t2 = -16t2 + 16t2

Combine like terms: -16t2 + 16t2 = 0
-6.5 + -40t + 16t2 = 0

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

Divide each side by '16'.
-0.40625 + -2.5t + t2 = 0

Move the constant term to the right:

Add '0.40625' to each side of the equation.
-0.40625 + -2.5t + 0.40625 + t2 = 0 + 0.40625

Reorder the terms:
-0.40625 + 0.40625 + -2.5t + t2 = 0 + 0.40625

Combine like terms: -0.40625 + 0.40625 = 0.00000
0.00000 + -2.5t + t2 = 0 + 0.40625
-2.5t + t2 = 0 + 0.40625

Combine like terms: 0 + 0.40625 = 0.40625
-2.5t + t2 = 0.40625

The t term is -2.5t.  Take half its coefficient (-1.25).
Square it (1.5625) and add it to both sides.

Add '1.5625' to each side of the equation.
-2.5t + 1.5625 + t2 = 0.40625 + 1.5625

Reorder the terms:
1.5625 + -2.5t + t2 = 0.40625 + 1.5625

Combine like terms: 0.40625 + 1.5625 = 1.96875
1.5625 + -2.5t + t2 = 1.96875

Factor a perfect square on the left side:
(t + -1.25)(t + -1.25) = 1.96875

Calculate the square root of the right side: 1.40312152

Break this problem into two subproblems by setting 
(t + -1.25) equal to 1.40312152 and -1.40312152.

Subproblem 1

t + -1.25 = 1.40312152 Simplifying t + -1.25 = 1.40312152 Reorder the terms: -1.25 + t = 1.40312152 Solving -1.25 + t = 1.40312152 Solving for variable 't'. Move all terms containing t to the left, all other terms to the right. Add '1.25' to each side of the equation. -1.25 + 1.25 + t = 1.40312152 + 1.25 Combine like terms: -1.25 + 1.25 = 0.00 0.00 + t = 1.40312152 + 1.25 t = 1.40312152 + 1.25 Combine like terms: 1.40312152 + 1.25 = 2.65312152 t = 2.65312152 Simplifying t = 2.65312152

Subproblem 2

t + -1.25 = -1.40312152 Simplifying t + -1.25 = -1.40312152 Reorder the terms: -1.25 + t = -1.40312152 Solving -1.25 + t = -1.40312152 Solving for variable 't'. Move all terms containing t to the left, all other terms to the right. Add '1.25' to each side of the equation. -1.25 + 1.25 + t = -1.40312152 + 1.25 Combine like terms: -1.25 + 1.25 = 0.00 0.00 + t = -1.40312152 + 1.25 t = -1.40312152 + 1.25 Combine like terms: -1.40312152 + 1.25 = -0.15312152 t = -0.15312152 Simplifying t = -0.15312152

Solution

The solution to the problem is based on the solutions from the subproblems. t = {2.65312152, -0.15312152}

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