18=5+30t-16t^2

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Solution for 18=5+30t-16t^2 equation:


Simplifying
18 = 5 + 30t + -16t2

Solving
18 = 5 + 30t + -16t2

Solving for variable 't'.

Combine like terms: 18 + -5 = 13
13 + -30t + 16t2 = 5 + 30t + -16t2 + -5 + -30t + 16t2

Reorder the terms:
13 + -30t + 16t2 = 5 + -5 + 30t + -30t + -16t2 + 16t2

Combine like terms: 5 + -5 = 0
13 + -30t + 16t2 = 0 + 30t + -30t + -16t2 + 16t2
13 + -30t + 16t2 = 30t + -30t + -16t2 + 16t2

Combine like terms: 30t + -30t = 0
13 + -30t + 16t2 = 0 + -16t2 + 16t2
13 + -30t + 16t2 = -16t2 + 16t2

Combine like terms: -16t2 + 16t2 = 0
13 + -30t + 16t2 = 0

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

Divide each side by '16'.
0.8125 + -1.875t + t2 = 0

Move the constant term to the right:

Add '-0.8125' to each side of the equation.
0.8125 + -1.875t + -0.8125 + t2 = 0 + -0.8125

Reorder the terms:
0.8125 + -0.8125 + -1.875t + t2 = 0 + -0.8125

Combine like terms: 0.8125 + -0.8125 = 0.0000
0.0000 + -1.875t + t2 = 0 + -0.8125
-1.875t + t2 = 0 + -0.8125

Combine like terms: 0 + -0.8125 = -0.8125
-1.875t + t2 = -0.8125

The t term is -1.875t.  Take half its coefficient (-0.9375).
Square it (0.87890625) and add it to both sides.

Add '0.87890625' to each side of the equation.
-1.875t + 0.87890625 + t2 = -0.8125 + 0.87890625

Reorder the terms:
0.87890625 + -1.875t + t2 = -0.8125 + 0.87890625

Combine like terms: -0.8125 + 0.87890625 = 0.06640625
0.87890625 + -1.875t + t2 = 0.06640625

Factor a perfect square on the left side:
(t + -0.9375)(t + -0.9375) = 0.06640625

Calculate the square root of the right side: 0.257694102

Break this problem into two subproblems by setting 
(t + -0.9375) equal to 0.257694102 and -0.257694102.

Subproblem 1

t + -0.9375 = 0.257694102 Simplifying t + -0.9375 = 0.257694102 Reorder the terms: -0.9375 + t = 0.257694102 Solving -0.9375 + t = 0.257694102 Solving for variable 't'. Move all terms containing t to the left, all other terms to the right. Add '0.9375' to each side of the equation. -0.9375 + 0.9375 + t = 0.257694102 + 0.9375 Combine like terms: -0.9375 + 0.9375 = 0.0000 0.0000 + t = 0.257694102 + 0.9375 t = 0.257694102 + 0.9375 Combine like terms: 0.257694102 + 0.9375 = 1.195194102 t = 1.195194102 Simplifying t = 1.195194102

Subproblem 2

t + -0.9375 = -0.257694102 Simplifying t + -0.9375 = -0.257694102 Reorder the terms: -0.9375 + t = -0.257694102 Solving -0.9375 + t = -0.257694102 Solving for variable 't'. Move all terms containing t to the left, all other terms to the right. Add '0.9375' to each side of the equation. -0.9375 + 0.9375 + t = -0.257694102 + 0.9375 Combine like terms: -0.9375 + 0.9375 = 0.0000 0.0000 + t = -0.257694102 + 0.9375 t = -0.257694102 + 0.9375 Combine like terms: -0.257694102 + 0.9375 = 0.679805898 t = 0.679805898 Simplifying t = 0.679805898

Solution

The solution to the problem is based on the solutions from the subproblems. t = {1.195194102, 0.679805898}

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