0=-4.9t^2+16t+5

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Solution for 0=-4.9t^2+16t+5 equation:


Simplifying
0 = -4.9t2 + 16t + 5

Reorder the terms:
0 = 5 + 16t + -4.9t2

Solving
0 = 5 + 16t + -4.9t2

Solving for variable 't'.

Combine like terms: 0 + -5 = -5
-5 + -16t + 4.9t2 = 5 + 16t + -4.9t2 + -5 + -16t + 4.9t2

Reorder the terms:
-5 + -16t + 4.9t2 = 5 + -5 + 16t + -16t + -4.9t2 + 4.9t2

Combine like terms: 5 + -5 = 0
-5 + -16t + 4.9t2 = 0 + 16t + -16t + -4.9t2 + 4.9t2
-5 + -16t + 4.9t2 = 16t + -16t + -4.9t2 + 4.9t2

Combine like terms: 16t + -16t = 0
-5 + -16t + 4.9t2 = 0 + -4.9t2 + 4.9t2
-5 + -16t + 4.9t2 = -4.9t2 + 4.9t2

Combine like terms: -4.9t2 + 4.9t2 = 0.0
-5 + -16t + 4.9t2 = 0.0

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

Divide each side by '4.9'.
-1.020408163 + -3.265306122t + t2 = 0

Move the constant term to the right:

Add '1.020408163' to each side of the equation.
-1.020408163 + -3.265306122t + 1.020408163 + t2 = 0 + 1.020408163

Reorder the terms:
-1.020408163 + 1.020408163 + -3.265306122t + t2 = 0 + 1.020408163

Combine like terms: -1.020408163 + 1.020408163 = 0.000000000
0.000000000 + -3.265306122t + t2 = 0 + 1.020408163
-3.265306122t + t2 = 0 + 1.020408163

Combine like terms: 0 + 1.020408163 = 1.020408163
-3.265306122t + t2 = 1.020408163

The t term is -3.265306122t.  Take half its coefficient (-1.632653061).
Square it (2.665556018) and add it to both sides.

Add '2.665556018' to each side of the equation.
-3.265306122t + 2.665556018 + t2 = 1.020408163 + 2.665556018

Reorder the terms:
2.665556018 + -3.265306122t + t2 = 1.020408163 + 2.665556018

Combine like terms: 1.020408163 + 2.665556018 = 3.685964181
2.665556018 + -3.265306122t + t2 = 3.685964181

Factor a perfect square on the left side:
(t + -1.632653061)(t + -1.632653061) = 3.685964181

Calculate the square root of the right side: 1.919886502

Break this problem into two subproblems by setting 
(t + -1.632653061) equal to 1.919886502 and -1.919886502.

Subproblem 1

t + -1.632653061 = 1.919886502 Simplifying t + -1.632653061 = 1.919886502 Reorder the terms: -1.632653061 + t = 1.919886502 Solving -1.632653061 + t = 1.919886502 Solving for variable 't'. Move all terms containing t to the left, all other terms to the right. Add '1.632653061' to each side of the equation. -1.632653061 + 1.632653061 + t = 1.919886502 + 1.632653061 Combine like terms: -1.632653061 + 1.632653061 = 0.000000000 0.000000000 + t = 1.919886502 + 1.632653061 t = 1.919886502 + 1.632653061 Combine like terms: 1.919886502 + 1.632653061 = 3.552539563 t = 3.552539563 Simplifying t = 3.552539563

Subproblem 2

t + -1.632653061 = -1.919886502 Simplifying t + -1.632653061 = -1.919886502 Reorder the terms: -1.632653061 + t = -1.919886502 Solving -1.632653061 + t = -1.919886502 Solving for variable 't'. Move all terms containing t to the left, all other terms to the right. Add '1.632653061' to each side of the equation. -1.632653061 + 1.632653061 + t = -1.919886502 + 1.632653061 Combine like terms: -1.632653061 + 1.632653061 = 0.000000000 0.000000000 + t = -1.919886502 + 1.632653061 t = -1.919886502 + 1.632653061 Combine like terms: -1.919886502 + 1.632653061 = -0.287233441 t = -0.287233441 Simplifying t = -0.287233441

Solution

The solution to the problem is based on the solutions from the subproblems. t = {3.552539563, -0.287233441}

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