-16t^2+40t+65=0

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Solution for -16t^2+40t+65=0 equation:


Simplifying
-16t2 + 40t + 65 = 0

Reorder the terms:
65 + 40t + -16t2 = 0

Solving
65 + 40t + -16t2 = 0

Solving for variable 't'.

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

Divide each side by '-16'.
-4.0625 + -2.5t + t2 = 0

Move the constant term to the right:

Add '4.0625' to each side of the equation.
-4.0625 + -2.5t + 4.0625 + t2 = 0 + 4.0625

Reorder the terms:
-4.0625 + 4.0625 + -2.5t + t2 = 0 + 4.0625

Combine like terms: -4.0625 + 4.0625 = 0.0000
0.0000 + -2.5t + t2 = 0 + 4.0625
-2.5t + t2 = 0 + 4.0625

Combine like terms: 0 + 4.0625 = 4.0625
-2.5t + t2 = 4.0625

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 = 4.0625 + 1.5625

Reorder the terms:
1.5625 + -2.5t + t2 = 4.0625 + 1.5625

Combine like terms: 4.0625 + 1.5625 = 5.625
1.5625 + -2.5t + t2 = 5.625

Factor a perfect square on the left side:
(t + -1.25)(t + -1.25) = 5.625

Calculate the square root of the right side: 2.371708245

Break this problem into two subproblems by setting 
(t + -1.25) equal to 2.371708245 and -2.371708245.

Subproblem 1

t + -1.25 = 2.371708245 Simplifying t + -1.25 = 2.371708245 Reorder the terms: -1.25 + t = 2.371708245 Solving -1.25 + t = 2.371708245 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 = 2.371708245 + 1.25 Combine like terms: -1.25 + 1.25 = 0.00 0.00 + t = 2.371708245 + 1.25 t = 2.371708245 + 1.25 Combine like terms: 2.371708245 + 1.25 = 3.621708245 t = 3.621708245 Simplifying t = 3.621708245

Subproblem 2

t + -1.25 = -2.371708245 Simplifying t + -1.25 = -2.371708245 Reorder the terms: -1.25 + t = -2.371708245 Solving -1.25 + t = -2.371708245 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 = -2.371708245 + 1.25 Combine like terms: -1.25 + 1.25 = 0.00 0.00 + t = -2.371708245 + 1.25 t = -2.371708245 + 1.25 Combine like terms: -2.371708245 + 1.25 = -1.121708245 t = -1.121708245 Simplifying t = -1.121708245

Solution

The solution to the problem is based on the solutions from the subproblems. t = {3.621708245, -1.121708245}

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