0=4.90t^2+19t-2.30

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Solution for 0=4.90t^2+19t-2.30 equation:


Simplifying
0 = 4.90t2 + 19t + -2.30

Reorder the terms:
0 = -2.30 + 19t + 4.90t2

Solving
0 = -2.30 + 19t + 4.90t2

Solving for variable 't'.

Combine like terms: 0 + 2.30 = 2.3
2.3 + -19t + -4.90t2 = -2.30 + 19t + 4.90t2 + 2.30 + -19t + -4.90t2

Reorder the terms:
2.3 + -19t + -4.90t2 = -2.30 + 2.30 + 19t + -19t + 4.90t2 + -4.90t2

Combine like terms: -2.30 + 2.30 = 0.00
2.3 + -19t + -4.90t2 = 0.00 + 19t + -19t + 4.90t2 + -4.90t2
2.3 + -19t + -4.90t2 = 19t + -19t + 4.90t2 + -4.90t2

Combine like terms: 19t + -19t = 0
2.3 + -19t + -4.90t2 = 0 + 4.90t2 + -4.90t2
2.3 + -19t + -4.90t2 = 4.90t2 + -4.90t2

Combine like terms: 4.90t2 + -4.90t2 = 0.00
2.3 + -19t + -4.90t2 = 0.00

Begin completing the square.  Divide all terms by
-4.90 the coefficient of the squared term: 

Divide each side by '-4.90'.
-0.4693877551 + 3.87755102t + t2 = 0

Move the constant term to the right:

Add '0.4693877551' to each side of the equation.
-0.4693877551 + 3.87755102t + 0.4693877551 + t2 = 0 + 0.4693877551

Reorder the terms:
-0.4693877551 + 0.4693877551 + 3.87755102t + t2 = 0 + 0.4693877551

Combine like terms: -0.4693877551 + 0.4693877551 = 0.0000000000
0.0000000000 + 3.87755102t + t2 = 0 + 0.4693877551
3.87755102t + t2 = 0 + 0.4693877551

Combine like terms: 0 + 0.4693877551 = 0.4693877551
3.87755102t + t2 = 0.4693877551

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 = 0.4693877551 + 3.758850478

Reorder the terms:
3.758850478 + 3.87755102t + t2 = 0.4693877551 + 3.758850478

Combine like terms: 0.4693877551 + 3.758850478 = 4.2282382331
3.758850478 + 3.87755102t + t2 = 4.2282382331

Factor a perfect square on the left side:
(t + 1.93877551)(t + 1.93877551) = 4.2282382331

Calculate the square root of the right side: 2.056268035

Break this problem into two subproblems by setting 
(t + 1.93877551) equal to 2.056268035 and -2.056268035.

Subproblem 1

t + 1.93877551 = 2.056268035 Simplifying t + 1.93877551 = 2.056268035 Reorder the terms: 1.93877551 + t = 2.056268035 Solving 1.93877551 + t = 2.056268035 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 = 2.056268035 + -1.93877551 Combine like terms: 1.93877551 + -1.93877551 = 0.00000000 0.00000000 + t = 2.056268035 + -1.93877551 t = 2.056268035 + -1.93877551 Combine like terms: 2.056268035 + -1.93877551 = 0.117492525 t = 0.117492525 Simplifying t = 0.117492525

Subproblem 2

t + 1.93877551 = -2.056268035 Simplifying t + 1.93877551 = -2.056268035 Reorder the terms: 1.93877551 + t = -2.056268035 Solving 1.93877551 + t = -2.056268035 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 = -2.056268035 + -1.93877551 Combine like terms: 1.93877551 + -1.93877551 = 0.00000000 0.00000000 + t = -2.056268035 + -1.93877551 t = -2.056268035 + -1.93877551 Combine like terms: -2.056268035 + -1.93877551 = -3.995043545 t = -3.995043545 Simplifying t = -3.995043545

Solution

The solution to the problem is based on the solutions from the subproblems. t = {0.117492525, -3.995043545}

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