8=19t-4.9t^2

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Solution for 8=19t-4.9t^2 equation:


Simplifying
8 = 19t + -4.9t2

Solving
8 = 19t + -4.9t2

Solving for variable 't'.

Reorder the terms:
8 + -19t + 4.9t2 = 19t + -19t + -4.9t2 + 4.9t2

Combine like terms: 19t + -19t = 0
8 + -19t + 4.9t2 = 0 + -4.9t2 + 4.9t2
8 + -19t + 4.9t2 = -4.9t2 + 4.9t2

Combine like terms: -4.9t2 + 4.9t2 = 0.0
8 + -19t + 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'.
1.632653061 + -3.87755102t + t2 = 0

Move the constant term to the right:

Add '-1.632653061' to each side of the equation.
1.632653061 + -3.87755102t + -1.632653061 + t2 = 0 + -1.632653061

Reorder the terms:
1.632653061 + -1.632653061 + -3.87755102t + t2 = 0 + -1.632653061

Combine like terms: 1.632653061 + -1.632653061 = 0.000000000
0.000000000 + -3.87755102t + t2 = 0 + -1.632653061
-3.87755102t + t2 = 0 + -1.632653061

Combine like terms: 0 + -1.632653061 = -1.632653061
-3.87755102t + t2 = -1.632653061

The t term is -3.87755102t.  Take half its coefficient (-1.93877551).
Square it (3.758850478) and add it to both sides.

Add '3.758850478' to each side of the equation.
-3.87755102t + 3.758850478 + t2 = -1.632653061 + 3.758850478

Reorder the terms:
3.758850478 + -3.87755102t + t2 = -1.632653061 + 3.758850478

Combine like terms: -1.632653061 + 3.758850478 = 2.126197417
3.758850478 + -3.87755102t + t2 = 2.126197417

Factor a perfect square on the left side:
(t + -1.93877551)(t + -1.93877551) = 2.126197417

Calculate the square root of the right side: 1.458148627

Break this problem into two subproblems by setting 
(t + -1.93877551) equal to 1.458148627 and -1.458148627.

Subproblem 1

t + -1.93877551 = 1.458148627 Simplifying t + -1.93877551 = 1.458148627 Reorder the terms: -1.93877551 + t = 1.458148627 Solving -1.93877551 + t = 1.458148627 Solving for variable 't'. Move all terms containing t to the left, all other terms to the right. Add '1.93877551' to each side of the equation. -1.93877551 + 1.93877551 + t = 1.458148627 + 1.93877551 Combine like terms: -1.93877551 + 1.93877551 = 0.00000000 0.00000000 + t = 1.458148627 + 1.93877551 t = 1.458148627 + 1.93877551 Combine like terms: 1.458148627 + 1.93877551 = 3.396924137 t = 3.396924137 Simplifying t = 3.396924137

Subproblem 2

t + -1.93877551 = -1.458148627 Simplifying t + -1.93877551 = -1.458148627 Reorder the terms: -1.93877551 + t = -1.458148627 Solving -1.93877551 + t = -1.458148627 Solving for variable 't'. Move all terms containing t to the left, all other terms to the right. Add '1.93877551' to each side of the equation. -1.93877551 + 1.93877551 + t = -1.458148627 + 1.93877551 Combine like terms: -1.93877551 + 1.93877551 = 0.00000000 0.00000000 + t = -1.458148627 + 1.93877551 t = -1.458148627 + 1.93877551 Combine like terms: -1.458148627 + 1.93877551 = 0.480626883 t = 0.480626883 Simplifying t = 0.480626883

Solution

The solution to the problem is based on the solutions from the subproblems. t = {3.396924137, 0.480626883}

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