0=-16t^2-9t+105

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Solution for 0=-16t^2-9t+105 equation:


Simplifying
0 = -16t2 + -9t + 105

Reorder the terms:
0 = 105 + -9t + -16t2

Solving
0 = 105 + -9t + -16t2

Solving for variable 't'.

Combine like terms: 0 + -105 = -105
-105 + 9t + 16t2 = 105 + -9t + -16t2 + -105 + 9t + 16t2

Reorder the terms:
-105 + 9t + 16t2 = 105 + -105 + -9t + 9t + -16t2 + 16t2

Combine like terms: 105 + -105 = 0
-105 + 9t + 16t2 = 0 + -9t + 9t + -16t2 + 16t2
-105 + 9t + 16t2 = -9t + 9t + -16t2 + 16t2

Combine like terms: -9t + 9t = 0
-105 + 9t + 16t2 = 0 + -16t2 + 16t2
-105 + 9t + 16t2 = -16t2 + 16t2

Combine like terms: -16t2 + 16t2 = 0
-105 + 9t + 16t2 = 0

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

Divide each side by '16'.
-6.5625 + 0.5625t + t2 = 0

Move the constant term to the right:

Add '6.5625' to each side of the equation.
-6.5625 + 0.5625t + 6.5625 + t2 = 0 + 6.5625

Reorder the terms:
-6.5625 + 6.5625 + 0.5625t + t2 = 0 + 6.5625

Combine like terms: -6.5625 + 6.5625 = 0.0000
0.0000 + 0.5625t + t2 = 0 + 6.5625
0.5625t + t2 = 0 + 6.5625

Combine like terms: 0 + 6.5625 = 6.5625
0.5625t + t2 = 6.5625

The t term is 0.5625t.  Take half its coefficient (0.28125).
Square it (0.0791015625) and add it to both sides.

Add '0.0791015625' to each side of the equation.
0.5625t + 0.0791015625 + t2 = 6.5625 + 0.0791015625

Reorder the terms:
0.0791015625 + 0.5625t + t2 = 6.5625 + 0.0791015625

Combine like terms: 6.5625 + 0.0791015625 = 6.6416015625
0.0791015625 + 0.5625t + t2 = 6.6416015625

Factor a perfect square on the left side:
(t + 0.28125)(t + 0.28125) = 6.6416015625

Calculate the square root of the right side: 2.57713049

Break this problem into two subproblems by setting 
(t + 0.28125) equal to 2.57713049 and -2.57713049.

Subproblem 1

t + 0.28125 = 2.57713049 Simplifying t + 0.28125 = 2.57713049 Reorder the terms: 0.28125 + t = 2.57713049 Solving 0.28125 + t = 2.57713049 Solving for variable 't'. Move all terms containing t to the left, all other terms to the right. Add '-0.28125' to each side of the equation. 0.28125 + -0.28125 + t = 2.57713049 + -0.28125 Combine like terms: 0.28125 + -0.28125 = 0.00000 0.00000 + t = 2.57713049 + -0.28125 t = 2.57713049 + -0.28125 Combine like terms: 2.57713049 + -0.28125 = 2.29588049 t = 2.29588049 Simplifying t = 2.29588049

Subproblem 2

t + 0.28125 = -2.57713049 Simplifying t + 0.28125 = -2.57713049 Reorder the terms: 0.28125 + t = -2.57713049 Solving 0.28125 + t = -2.57713049 Solving for variable 't'. Move all terms containing t to the left, all other terms to the right. Add '-0.28125' to each side of the equation. 0.28125 + -0.28125 + t = -2.57713049 + -0.28125 Combine like terms: 0.28125 + -0.28125 = 0.00000 0.00000 + t = -2.57713049 + -0.28125 t = -2.57713049 + -0.28125 Combine like terms: -2.57713049 + -0.28125 = -2.85838049 t = -2.85838049 Simplifying t = -2.85838049

Solution

The solution to the problem is based on the solutions from the subproblems. t = {2.29588049, -2.85838049}

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