0=45+25t-16t^2

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Solution for 0=45+25t-16t^2 equation:


Simplifying
0 = 45 + 25t + -16t2

Solving
0 = 45 + 25t + -16t2

Solving for variable 't'.

Combine like terms: 0 + -45 = -45
-45 + -25t + 16t2 = 45 + 25t + -16t2 + -45 + -25t + 16t2

Reorder the terms:
-45 + -25t + 16t2 = 45 + -45 + 25t + -25t + -16t2 + 16t2

Combine like terms: 45 + -45 = 0
-45 + -25t + 16t2 = 0 + 25t + -25t + -16t2 + 16t2
-45 + -25t + 16t2 = 25t + -25t + -16t2 + 16t2

Combine like terms: 25t + -25t = 0
-45 + -25t + 16t2 = 0 + -16t2 + 16t2
-45 + -25t + 16t2 = -16t2 + 16t2

Combine like terms: -16t2 + 16t2 = 0
-45 + -25t + 16t2 = 0

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

Divide each side by '16'.
-2.8125 + -1.5625t + t2 = 0

Move the constant term to the right:

Add '2.8125' to each side of the equation.
-2.8125 + -1.5625t + 2.8125 + t2 = 0 + 2.8125

Reorder the terms:
-2.8125 + 2.8125 + -1.5625t + t2 = 0 + 2.8125

Combine like terms: -2.8125 + 2.8125 = 0.0000
0.0000 + -1.5625t + t2 = 0 + 2.8125
-1.5625t + t2 = 0 + 2.8125

Combine like terms: 0 + 2.8125 = 2.8125
-1.5625t + t2 = 2.8125

The t term is -1.5625t.  Take half its coefficient (-0.78125).
Square it (0.6103515625) and add it to both sides.

Add '0.6103515625' to each side of the equation.
-1.5625t + 0.6103515625 + t2 = 2.8125 + 0.6103515625

Reorder the terms:
0.6103515625 + -1.5625t + t2 = 2.8125 + 0.6103515625

Combine like terms: 2.8125 + 0.6103515625 = 3.4228515625
0.6103515625 + -1.5625t + t2 = 3.4228515625

Factor a perfect square on the left side:
(t + -0.78125)(t + -0.78125) = 3.4228515625

Calculate the square root of the right side: 1.850095014

Break this problem into two subproblems by setting 
(t + -0.78125) equal to 1.850095014 and -1.850095014.

Subproblem 1

t + -0.78125 = 1.850095014 Simplifying t + -0.78125 = 1.850095014 Reorder the terms: -0.78125 + t = 1.850095014 Solving -0.78125 + t = 1.850095014 Solving for variable 't'. Move all terms containing t to the left, all other terms to the right. Add '0.78125' to each side of the equation. -0.78125 + 0.78125 + t = 1.850095014 + 0.78125 Combine like terms: -0.78125 + 0.78125 = 0.00000 0.00000 + t = 1.850095014 + 0.78125 t = 1.850095014 + 0.78125 Combine like terms: 1.850095014 + 0.78125 = 2.631345014 t = 2.631345014 Simplifying t = 2.631345014

Subproblem 2

t + -0.78125 = -1.850095014 Simplifying t + -0.78125 = -1.850095014 Reorder the terms: -0.78125 + t = -1.850095014 Solving -0.78125 + t = -1.850095014 Solving for variable 't'. Move all terms containing t to the left, all other terms to the right. Add '0.78125' to each side of the equation. -0.78125 + 0.78125 + t = -1.850095014 + 0.78125 Combine like terms: -0.78125 + 0.78125 = 0.00000 0.00000 + t = -1.850095014 + 0.78125 t = -1.850095014 + 0.78125 Combine like terms: -1.850095014 + 0.78125 = -1.068845014 t = -1.068845014 Simplifying t = -1.068845014

Solution

The solution to the problem is based on the solutions from the subproblems. t = {2.631345014, -1.068845014}

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