-25=-16t^2+72t

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Solution for -25=-16t^2+72t equation:


Simplifying
-25 = -16t2 + 72t

Reorder the terms:
-25 = 72t + -16t2

Solving
-25 = 72t + -16t2

Solving for variable 't'.

Reorder the terms:
-25 + -72t + 16t2 = 72t + -72t + -16t2 + 16t2

Combine like terms: 72t + -72t = 0
-25 + -72t + 16t2 = 0 + -16t2 + 16t2
-25 + -72t + 16t2 = -16t2 + 16t2

Combine like terms: -16t2 + 16t2 = 0
-25 + -72t + 16t2 = 0

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

Divide each side by '16'.
-1.5625 + -4.5t + t2 = 0

Move the constant term to the right:

Add '1.5625' to each side of the equation.
-1.5625 + -4.5t + 1.5625 + t2 = 0 + 1.5625

Reorder the terms:
-1.5625 + 1.5625 + -4.5t + t2 = 0 + 1.5625

Combine like terms: -1.5625 + 1.5625 = 0.0000
0.0000 + -4.5t + t2 = 0 + 1.5625
-4.5t + t2 = 0 + 1.5625

Combine like terms: 0 + 1.5625 = 1.5625
-4.5t + t2 = 1.5625

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 = 1.5625 + 5.0625

Reorder the terms:
5.0625 + -4.5t + t2 = 1.5625 + 5.0625

Combine like terms: 1.5625 + 5.0625 = 6.625
5.0625 + -4.5t + t2 = 6.625

Factor a perfect square on the left side:
(t + -2.25)(t + -2.25) = 6.625

Calculate the square root of the right side: 2.573907535

Break this problem into two subproblems by setting 
(t + -2.25) equal to 2.573907535 and -2.573907535.

Subproblem 1

t + -2.25 = 2.573907535 Simplifying t + -2.25 = 2.573907535 Reorder the terms: -2.25 + t = 2.573907535 Solving -2.25 + t = 2.573907535 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 = 2.573907535 + 2.25 Combine like terms: -2.25 + 2.25 = 0.00 0.00 + t = 2.573907535 + 2.25 t = 2.573907535 + 2.25 Combine like terms: 2.573907535 + 2.25 = 4.823907535 t = 4.823907535 Simplifying t = 4.823907535

Subproblem 2

t + -2.25 = -2.573907535 Simplifying t + -2.25 = -2.573907535 Reorder the terms: -2.25 + t = -2.573907535 Solving -2.25 + t = -2.573907535 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 = -2.573907535 + 2.25 Combine like terms: -2.25 + 2.25 = 0.00 0.00 + t = -2.573907535 + 2.25 t = -2.573907535 + 2.25 Combine like terms: -2.573907535 + 2.25 = -0.323907535 t = -0.323907535 Simplifying t = -0.323907535

Solution

The solution to the problem is based on the solutions from the subproblems. t = {4.823907535, -0.323907535}

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