0=-16t^2+20t+3

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Solution for 0=-16t^2+20t+3 equation:


Simplifying
0 = -16t2 + 20t + 3

Reorder the terms:
0 = 3 + 20t + -16t2

Solving
0 = 3 + 20t + -16t2

Solving for variable 't'.

Combine like terms: 0 + -3 = -3
-3 + -20t + 16t2 = 3 + 20t + -16t2 + -3 + -20t + 16t2

Reorder the terms:
-3 + -20t + 16t2 = 3 + -3 + 20t + -20t + -16t2 + 16t2

Combine like terms: 3 + -3 = 0
-3 + -20t + 16t2 = 0 + 20t + -20t + -16t2 + 16t2
-3 + -20t + 16t2 = 20t + -20t + -16t2 + 16t2

Combine like terms: 20t + -20t = 0
-3 + -20t + 16t2 = 0 + -16t2 + 16t2
-3 + -20t + 16t2 = -16t2 + 16t2

Combine like terms: -16t2 + 16t2 = 0
-3 + -20t + 16t2 = 0

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

Divide each side by '16'.
-0.1875 + -1.25t + t2 = 0

Move the constant term to the right:

Add '0.1875' to each side of the equation.
-0.1875 + -1.25t + 0.1875 + t2 = 0 + 0.1875

Reorder the terms:
-0.1875 + 0.1875 + -1.25t + t2 = 0 + 0.1875

Combine like terms: -0.1875 + 0.1875 = 0.0000
0.0000 + -1.25t + t2 = 0 + 0.1875
-1.25t + t2 = 0 + 0.1875

Combine like terms: 0 + 0.1875 = 0.1875
-1.25t + t2 = 0.1875

The t term is -1.25t.  Take half its coefficient (-0.625).
Square it (0.390625) and add it to both sides.

Add '0.390625' to each side of the equation.
-1.25t + 0.390625 + t2 = 0.1875 + 0.390625

Reorder the terms:
0.390625 + -1.25t + t2 = 0.1875 + 0.390625

Combine like terms: 0.1875 + 0.390625 = 0.578125
0.390625 + -1.25t + t2 = 0.578125

Factor a perfect square on the left side:
(t + -0.625)(t + -0.625) = 0.578125

Calculate the square root of the right side: 0.760345316

Break this problem into two subproblems by setting 
(t + -0.625) equal to 0.760345316 and -0.760345316.

Subproblem 1

t + -0.625 = 0.760345316 Simplifying t + -0.625 = 0.760345316 Reorder the terms: -0.625 + t = 0.760345316 Solving -0.625 + t = 0.760345316 Solving for variable 't'. Move all terms containing t to the left, all other terms to the right. Add '0.625' to each side of the equation. -0.625 + 0.625 + t = 0.760345316 + 0.625 Combine like terms: -0.625 + 0.625 = 0.000 0.000 + t = 0.760345316 + 0.625 t = 0.760345316 + 0.625 Combine like terms: 0.760345316 + 0.625 = 1.385345316 t = 1.385345316 Simplifying t = 1.385345316

Subproblem 2

t + -0.625 = -0.760345316 Simplifying t + -0.625 = -0.760345316 Reorder the terms: -0.625 + t = -0.760345316 Solving -0.625 + t = -0.760345316 Solving for variable 't'. Move all terms containing t to the left, all other terms to the right. Add '0.625' to each side of the equation. -0.625 + 0.625 + t = -0.760345316 + 0.625 Combine like terms: -0.625 + 0.625 = 0.000 0.000 + t = -0.760345316 + 0.625 t = -0.760345316 + 0.625 Combine like terms: -0.760345316 + 0.625 = -0.135345316 t = -0.135345316 Simplifying t = -0.135345316

Solution

The solution to the problem is based on the solutions from the subproblems. t = {1.385345316, -0.135345316}

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