0=-16t^2+72t+5

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Solution for 0=-16t^2+72t+5 equation:


Simplifying
0 = -16t2 + 72t + 5

Reorder the terms:
0 = 5 + 72t + -16t2

Solving
0 = 5 + 72t + -16t2

Solving for variable 't'.

Combine like terms: 0 + -5 = -5
-5 + -72t + 16t2 = 5 + 72t + -16t2 + -5 + -72t + 16t2

Reorder the terms:
-5 + -72t + 16t2 = 5 + -5 + 72t + -72t + -16t2 + 16t2

Combine like terms: 5 + -5 = 0
-5 + -72t + 16t2 = 0 + 72t + -72t + -16t2 + 16t2
-5 + -72t + 16t2 = 72t + -72t + -16t2 + 16t2

Combine like terms: 72t + -72t = 0
-5 + -72t + 16t2 = 0 + -16t2 + 16t2
-5 + -72t + 16t2 = -16t2 + 16t2

Combine like terms: -16t2 + 16t2 = 0
-5 + -72t + 16t2 = 0

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

Divide each side by '16'.
-0.3125 + -4.5t + t2 = 0

Move the constant term to the right:

Add '0.3125' to each side of the equation.
-0.3125 + -4.5t + 0.3125 + t2 = 0 + 0.3125

Reorder the terms:
-0.3125 + 0.3125 + -4.5t + t2 = 0 + 0.3125

Combine like terms: -0.3125 + 0.3125 = 0.0000
0.0000 + -4.5t + t2 = 0 + 0.3125
-4.5t + t2 = 0 + 0.3125

Combine like terms: 0 + 0.3125 = 0.3125
-4.5t + t2 = 0.3125

The t term is -4.5t.  Take half its coefficient (-2.25).
Square it (5.0625) and add it to both sides.

Add '5.0625' to each side of the equation.
-4.5t + 5.0625 + t2 = 0.3125 + 5.0625

Reorder the terms:
5.0625 + -4.5t + t2 = 0.3125 + 5.0625

Combine like terms: 0.3125 + 5.0625 = 5.375
5.0625 + -4.5t + t2 = 5.375

Factor a perfect square on the left side:
(t + -2.25)(t + -2.25) = 5.375

Calculate the square root of the right side: 2.318404624

Break this problem into two subproblems by setting 
(t + -2.25) equal to 2.318404624 and -2.318404624.

Subproblem 1

t + -2.25 = 2.318404624 Simplifying t + -2.25 = 2.318404624 Reorder the terms: -2.25 + t = 2.318404624 Solving -2.25 + t = 2.318404624 Solving for variable 't'. Move all terms containing t to the left, all other terms to the right. Add '2.25' to each side of the equation. -2.25 + 2.25 + t = 2.318404624 + 2.25 Combine like terms: -2.25 + 2.25 = 0.00 0.00 + t = 2.318404624 + 2.25 t = 2.318404624 + 2.25 Combine like terms: 2.318404624 + 2.25 = 4.568404624 t = 4.568404624 Simplifying t = 4.568404624

Subproblem 2

t + -2.25 = -2.318404624 Simplifying t + -2.25 = -2.318404624 Reorder the terms: -2.25 + t = -2.318404624 Solving -2.25 + t = -2.318404624 Solving for variable 't'. Move all terms containing t to the left, all other terms to the right. Add '2.25' to each side of the equation. -2.25 + 2.25 + t = -2.318404624 + 2.25 Combine like terms: -2.25 + 2.25 = 0.00 0.00 + t = -2.318404624 + 2.25 t = -2.318404624 + 2.25 Combine like terms: -2.318404624 + 2.25 = -0.068404624 t = -0.068404624 Simplifying t = -0.068404624

Solution

The solution to the problem is based on the solutions from the subproblems. t = {4.568404624, -0.068404624}

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