0=-16t^2+5t+30

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Solution for 0=-16t^2+5t+30 equation:


Simplifying
0 = -16t2 + 5t + 30

Reorder the terms:
0 = 30 + 5t + -16t2

Solving
0 = 30 + 5t + -16t2

Solving for variable 't'.

Combine like terms: 0 + -30 = -30
-30 + -5t + 16t2 = 30 + 5t + -16t2 + -30 + -5t + 16t2

Reorder the terms:
-30 + -5t + 16t2 = 30 + -30 + 5t + -5t + -16t2 + 16t2

Combine like terms: 30 + -30 = 0
-30 + -5t + 16t2 = 0 + 5t + -5t + -16t2 + 16t2
-30 + -5t + 16t2 = 5t + -5t + -16t2 + 16t2

Combine like terms: 5t + -5t = 0
-30 + -5t + 16t2 = 0 + -16t2 + 16t2
-30 + -5t + 16t2 = -16t2 + 16t2

Combine like terms: -16t2 + 16t2 = 0
-30 + -5t + 16t2 = 0

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

Divide each side by '16'.
-1.875 + -0.3125t + t2 = 0

Move the constant term to the right:

Add '1.875' to each side of the equation.
-1.875 + -0.3125t + 1.875 + t2 = 0 + 1.875

Reorder the terms:
-1.875 + 1.875 + -0.3125t + t2 = 0 + 1.875

Combine like terms: -1.875 + 1.875 = 0.000
0.000 + -0.3125t + t2 = 0 + 1.875
-0.3125t + t2 = 0 + 1.875

Combine like terms: 0 + 1.875 = 1.875
-0.3125t + t2 = 1.875

The t term is -0.3125t.  Take half its coefficient (-0.15625).
Square it (0.0244140625) and add it to both sides.

Add '0.0244140625' to each side of the equation.
-0.3125t + 0.0244140625 + t2 = 1.875 + 0.0244140625

Reorder the terms:
0.0244140625 + -0.3125t + t2 = 1.875 + 0.0244140625

Combine like terms: 1.875 + 0.0244140625 = 1.8994140625
0.0244140625 + -0.3125t + t2 = 1.8994140625

Factor a perfect square on the left side:
(t + -0.15625)(t + -0.15625) = 1.8994140625

Calculate the square root of the right side: 1.378192317

Break this problem into two subproblems by setting 
(t + -0.15625) equal to 1.378192317 and -1.378192317.

Subproblem 1

t + -0.15625 = 1.378192317 Simplifying t + -0.15625 = 1.378192317 Reorder the terms: -0.15625 + t = 1.378192317 Solving -0.15625 + t = 1.378192317 Solving for variable 't'. Move all terms containing t to the left, all other terms to the right. Add '0.15625' to each side of the equation. -0.15625 + 0.15625 + t = 1.378192317 + 0.15625 Combine like terms: -0.15625 + 0.15625 = 0.00000 0.00000 + t = 1.378192317 + 0.15625 t = 1.378192317 + 0.15625 Combine like terms: 1.378192317 + 0.15625 = 1.534442317 t = 1.534442317 Simplifying t = 1.534442317

Subproblem 2

t + -0.15625 = -1.378192317 Simplifying t + -0.15625 = -1.378192317 Reorder the terms: -0.15625 + t = -1.378192317 Solving -0.15625 + t = -1.378192317 Solving for variable 't'. Move all terms containing t to the left, all other terms to the right. Add '0.15625' to each side of the equation. -0.15625 + 0.15625 + t = -1.378192317 + 0.15625 Combine like terms: -0.15625 + 0.15625 = 0.00000 0.00000 + t = -1.378192317 + 0.15625 t = -1.378192317 + 0.15625 Combine like terms: -1.378192317 + 0.15625 = -1.221942317 t = -1.221942317 Simplifying t = -1.221942317

Solution

The solution to the problem is based on the solutions from the subproblems. t = {1.534442317, -1.221942317}

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