0=-16t^2+72t+7

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Solution for 0=-16t^2+72t+7 equation:


Simplifying
0 = -16t2 + 72t + 7

Reorder the terms:
0 = 7 + 72t + -16t2

Solving
0 = 7 + 72t + -16t2

Solving for variable 't'.

Combine like terms: 0 + -7 = -7
-7 + -72t + 16t2 = 7 + 72t + -16t2 + -7 + -72t + 16t2

Reorder the terms:
-7 + -72t + 16t2 = 7 + -7 + 72t + -72t + -16t2 + 16t2

Combine like terms: 7 + -7 = 0
-7 + -72t + 16t2 = 0 + 72t + -72t + -16t2 + 16t2
-7 + -72t + 16t2 = 72t + -72t + -16t2 + 16t2

Combine like terms: 72t + -72t = 0
-7 + -72t + 16t2 = 0 + -16t2 + 16t2
-7 + -72t + 16t2 = -16t2 + 16t2

Combine like terms: -16t2 + 16t2 = 0
-7 + -72t + 16t2 = 0

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

Divide each side by '16'.
-0.4375 + -4.5t + t2 = 0

Move the constant term to the right:

Add '0.4375' to each side of the equation.
-0.4375 + -4.5t + 0.4375 + t2 = 0 + 0.4375

Reorder the terms:
-0.4375 + 0.4375 + -4.5t + t2 = 0 + 0.4375

Combine like terms: -0.4375 + 0.4375 = 0.0000
0.0000 + -4.5t + t2 = 0 + 0.4375
-4.5t + t2 = 0 + 0.4375

Combine like terms: 0 + 0.4375 = 0.4375
-4.5t + t2 = 0.4375

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 = 0.4375 + 5.0625

Reorder the terms:
5.0625 + -4.5t + t2 = 0.4375 + 5.0625

Combine like terms: 0.4375 + 5.0625 = 5.5
5.0625 + -4.5t + t2 = 5.5

Factor a perfect square on the left side:
(t + -2.25)(t + -2.25) = 5.5

Calculate the square root of the right side: 2.34520788

Break this problem into two subproblems by setting 
(t + -2.25) equal to 2.34520788 and -2.34520788.

Subproblem 1

t + -2.25 = 2.34520788 Simplifying t + -2.25 = 2.34520788 Reorder the terms: -2.25 + t = 2.34520788 Solving -2.25 + t = 2.34520788 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 = 2.34520788 + 2.25 Combine like terms: -2.25 + 2.25 = 0.00 0.00 + t = 2.34520788 + 2.25 t = 2.34520788 + 2.25 Combine like terms: 2.34520788 + 2.25 = 4.59520788 t = 4.59520788 Simplifying t = 4.59520788

Subproblem 2

t + -2.25 = -2.34520788 Simplifying t + -2.25 = -2.34520788 Reorder the terms: -2.25 + t = -2.34520788 Solving -2.25 + t = -2.34520788 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 = -2.34520788 + 2.25 Combine like terms: -2.25 + 2.25 = 0.00 0.00 + t = -2.34520788 + 2.25 t = -2.34520788 + 2.25 Combine like terms: -2.34520788 + 2.25 = -0.09520788 t = -0.09520788 Simplifying t = -0.09520788

Solution

The solution to the problem is based on the solutions from the subproblems. t = {4.59520788, -0.09520788}

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