0=-16t^2-8t+69

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Solution for 0=-16t^2-8t+69 equation:


Simplifying
0 = -16t2 + -8t + 69

Reorder the terms:
0 = 69 + -8t + -16t2

Solving
0 = 69 + -8t + -16t2

Solving for variable 't'.

Combine like terms: 0 + -69 = -69
-69 + 8t + 16t2 = 69 + -8t + -16t2 + -69 + 8t + 16t2

Reorder the terms:
-69 + 8t + 16t2 = 69 + -69 + -8t + 8t + -16t2 + 16t2

Combine like terms: 69 + -69 = 0
-69 + 8t + 16t2 = 0 + -8t + 8t + -16t2 + 16t2
-69 + 8t + 16t2 = -8t + 8t + -16t2 + 16t2

Combine like terms: -8t + 8t = 0
-69 + 8t + 16t2 = 0 + -16t2 + 16t2
-69 + 8t + 16t2 = -16t2 + 16t2

Combine like terms: -16t2 + 16t2 = 0
-69 + 8t + 16t2 = 0

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

Divide each side by '16'.
-4.3125 + 0.5t + t2 = 0

Move the constant term to the right:

Add '4.3125' to each side of the equation.
-4.3125 + 0.5t + 4.3125 + t2 = 0 + 4.3125

Reorder the terms:
-4.3125 + 4.3125 + 0.5t + t2 = 0 + 4.3125

Combine like terms: -4.3125 + 4.3125 = 0.0000
0.0000 + 0.5t + t2 = 0 + 4.3125
0.5t + t2 = 0 + 4.3125

Combine like terms: 0 + 4.3125 = 4.3125
0.5t + t2 = 4.3125

The t term is 0.5t.  Take half its coefficient (0.25).
Square it (0.0625) and add it to both sides.

Add '0.0625' to each side of the equation.
0.5t + 0.0625 + t2 = 4.3125 + 0.0625

Reorder the terms:
0.0625 + 0.5t + t2 = 4.3125 + 0.0625

Combine like terms: 4.3125 + 0.0625 = 4.375
0.0625 + 0.5t + t2 = 4.375

Factor a perfect square on the left side:
(t + 0.25)(t + 0.25) = 4.375

Calculate the square root of the right side: 2.091650066

Break this problem into two subproblems by setting 
(t + 0.25) equal to 2.091650066 and -2.091650066.

Subproblem 1

t + 0.25 = 2.091650066 Simplifying t + 0.25 = 2.091650066 Reorder the terms: 0.25 + t = 2.091650066 Solving 0.25 + t = 2.091650066 Solving for variable 't'. Move all terms containing t to the left, all other terms to the right. Add '-0.25' to each side of the equation. 0.25 + -0.25 + t = 2.091650066 + -0.25 Combine like terms: 0.25 + -0.25 = 0.00 0.00 + t = 2.091650066 + -0.25 t = 2.091650066 + -0.25 Combine like terms: 2.091650066 + -0.25 = 1.841650066 t = 1.841650066 Simplifying t = 1.841650066

Subproblem 2

t + 0.25 = -2.091650066 Simplifying t + 0.25 = -2.091650066 Reorder the terms: 0.25 + t = -2.091650066 Solving 0.25 + t = -2.091650066 Solving for variable 't'. Move all terms containing t to the left, all other terms to the right. Add '-0.25' to each side of the equation. 0.25 + -0.25 + t = -2.091650066 + -0.25 Combine like terms: 0.25 + -0.25 = 0.00 0.00 + t = -2.091650066 + -0.25 t = -2.091650066 + -0.25 Combine like terms: -2.091650066 + -0.25 = -2.341650066 t = -2.341650066 Simplifying t = -2.341650066

Solution

The solution to the problem is based on the solutions from the subproblems. t = {1.841650066, -2.341650066}

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