0=-16t^2+18t+25

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Solution for 0=-16t^2+18t+25 equation:


Simplifying
0 = -16t2 + 18t + 25

Reorder the terms:
0 = 25 + 18t + -16t2

Solving
0 = 25 + 18t + -16t2

Solving for variable 't'.

Combine like terms: 0 + -25 = -25
-25 + -18t + 16t2 = 25 + 18t + -16t2 + -25 + -18t + 16t2

Reorder the terms:
-25 + -18t + 16t2 = 25 + -25 + 18t + -18t + -16t2 + 16t2

Combine like terms: 25 + -25 = 0
-25 + -18t + 16t2 = 0 + 18t + -18t + -16t2 + 16t2
-25 + -18t + 16t2 = 18t + -18t + -16t2 + 16t2

Combine like terms: 18t + -18t = 0
-25 + -18t + 16t2 = 0 + -16t2 + 16t2
-25 + -18t + 16t2 = -16t2 + 16t2

Combine like terms: -16t2 + 16t2 = 0
-25 + -18t + 16t2 = 0

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

Divide each side by '16'.
-1.5625 + -1.125t + t2 = 0

Move the constant term to the right:

Add '1.5625' to each side of the equation.
-1.5625 + -1.125t + 1.5625 + t2 = 0 + 1.5625

Reorder the terms:
-1.5625 + 1.5625 + -1.125t + t2 = 0 + 1.5625

Combine like terms: -1.5625 + 1.5625 = 0.0000
0.0000 + -1.125t + t2 = 0 + 1.5625
-1.125t + t2 = 0 + 1.5625

Combine like terms: 0 + 1.5625 = 1.5625
-1.125t + t2 = 1.5625

The t term is -1.125t.  Take half its coefficient (-0.5625).
Square it (0.31640625) and add it to both sides.

Add '0.31640625' to each side of the equation.
-1.125t + 0.31640625 + t2 = 1.5625 + 0.31640625

Reorder the terms:
0.31640625 + -1.125t + t2 = 1.5625 + 0.31640625

Combine like terms: 1.5625 + 0.31640625 = 1.87890625
0.31640625 + -1.125t + t2 = 1.87890625

Factor a perfect square on the left side:
(t + -0.5625)(t + -0.5625) = 1.87890625

Calculate the square root of the right side: 1.370732012

Break this problem into two subproblems by setting 
(t + -0.5625) equal to 1.370732012 and -1.370732012.

Subproblem 1

t + -0.5625 = 1.370732012 Simplifying t + -0.5625 = 1.370732012 Reorder the terms: -0.5625 + t = 1.370732012 Solving -0.5625 + t = 1.370732012 Solving for variable 't'. Move all terms containing t to the left, all other terms to the right. Add '0.5625' to each side of the equation. -0.5625 + 0.5625 + t = 1.370732012 + 0.5625 Combine like terms: -0.5625 + 0.5625 = 0.0000 0.0000 + t = 1.370732012 + 0.5625 t = 1.370732012 + 0.5625 Combine like terms: 1.370732012 + 0.5625 = 1.933232012 t = 1.933232012 Simplifying t = 1.933232012

Subproblem 2

t + -0.5625 = -1.370732012 Simplifying t + -0.5625 = -1.370732012 Reorder the terms: -0.5625 + t = -1.370732012 Solving -0.5625 + t = -1.370732012 Solving for variable 't'. Move all terms containing t to the left, all other terms to the right. Add '0.5625' to each side of the equation. -0.5625 + 0.5625 + t = -1.370732012 + 0.5625 Combine like terms: -0.5625 + 0.5625 = 0.0000 0.0000 + t = -1.370732012 + 0.5625 t = -1.370732012 + 0.5625 Combine like terms: -1.370732012 + 0.5625 = -0.808232012 t = -0.808232012 Simplifying t = -0.808232012

Solution

The solution to the problem is based on the solutions from the subproblems. t = {1.933232012, -0.808232012}

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