0=-16t^2+36t+9

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Solution for 0=-16t^2+36t+9 equation:


Simplifying
0 = -16t2 + 36t + 9

Reorder the terms:
0 = 9 + 36t + -16t2

Solving
0 = 9 + 36t + -16t2

Solving for variable 't'.

Combine like terms: 0 + -9 = -9
-9 + -36t + 16t2 = 9 + 36t + -16t2 + -9 + -36t + 16t2

Reorder the terms:
-9 + -36t + 16t2 = 9 + -9 + 36t + -36t + -16t2 + 16t2

Combine like terms: 9 + -9 = 0
-9 + -36t + 16t2 = 0 + 36t + -36t + -16t2 + 16t2
-9 + -36t + 16t2 = 36t + -36t + -16t2 + 16t2

Combine like terms: 36t + -36t = 0
-9 + -36t + 16t2 = 0 + -16t2 + 16t2
-9 + -36t + 16t2 = -16t2 + 16t2

Combine like terms: -16t2 + 16t2 = 0
-9 + -36t + 16t2 = 0

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

Divide each side by '16'.
-0.5625 + -2.25t + t2 = 0

Move the constant term to the right:

Add '0.5625' to each side of the equation.
-0.5625 + -2.25t + 0.5625 + t2 = 0 + 0.5625

Reorder the terms:
-0.5625 + 0.5625 + -2.25t + t2 = 0 + 0.5625

Combine like terms: -0.5625 + 0.5625 = 0.0000
0.0000 + -2.25t + t2 = 0 + 0.5625
-2.25t + t2 = 0 + 0.5625

Combine like terms: 0 + 0.5625 = 0.5625
-2.25t + t2 = 0.5625

The t term is -2.25t.  Take half its coefficient (-1.125).
Square it (1.265625) and add it to both sides.

Add '1.265625' to each side of the equation.
-2.25t + 1.265625 + t2 = 0.5625 + 1.265625

Reorder the terms:
1.265625 + -2.25t + t2 = 0.5625 + 1.265625

Combine like terms: 0.5625 + 1.265625 = 1.828125
1.265625 + -2.25t + t2 = 1.828125

Factor a perfect square on the left side:
(t + -1.125)(t + -1.125) = 1.828125

Calculate the square root of the right side: 1.352081728

Break this problem into two subproblems by setting 
(t + -1.125) equal to 1.352081728 and -1.352081728.

Subproblem 1

t + -1.125 = 1.352081728 Simplifying t + -1.125 = 1.352081728 Reorder the terms: -1.125 + t = 1.352081728 Solving -1.125 + t = 1.352081728 Solving for variable 't'. Move all terms containing t to the left, all other terms to the right. Add '1.125' to each side of the equation. -1.125 + 1.125 + t = 1.352081728 + 1.125 Combine like terms: -1.125 + 1.125 = 0.000 0.000 + t = 1.352081728 + 1.125 t = 1.352081728 + 1.125 Combine like terms: 1.352081728 + 1.125 = 2.477081728 t = 2.477081728 Simplifying t = 2.477081728

Subproblem 2

t + -1.125 = -1.352081728 Simplifying t + -1.125 = -1.352081728 Reorder the terms: -1.125 + t = -1.352081728 Solving -1.125 + t = -1.352081728 Solving for variable 't'. Move all terms containing t to the left, all other terms to the right. Add '1.125' to each side of the equation. -1.125 + 1.125 + t = -1.352081728 + 1.125 Combine like terms: -1.125 + 1.125 = 0.000 0.000 + t = -1.352081728 + 1.125 t = -1.352081728 + 1.125 Combine like terms: -1.352081728 + 1.125 = -0.227081728 t = -0.227081728 Simplifying t = -0.227081728

Solution

The solution to the problem is based on the solutions from the subproblems. t = {2.477081728, -0.227081728}

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