4.9t^2-19t-1.8=0

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Solution for 4.9t^2-19t-1.8=0 equation:


Simplifying
4.9t2 + -19t + -1.8 = 0

Reorder the terms:
-1.8 + -19t + 4.9t2 = 0

Solving
-1.8 + -19t + 4.9t2 = 0

Solving for variable 't'.

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

Divide each side by '4.9'.
-0.3673469388 + -3.87755102t + t2 = 0

Move the constant term to the right:

Add '0.3673469388' to each side of the equation.
-0.3673469388 + -3.87755102t + 0.3673469388 + t2 = 0 + 0.3673469388

Reorder the terms:
-0.3673469388 + 0.3673469388 + -3.87755102t + t2 = 0 + 0.3673469388

Combine like terms: -0.3673469388 + 0.3673469388 = 0.0000000000
0.0000000000 + -3.87755102t + t2 = 0 + 0.3673469388
-3.87755102t + t2 = 0 + 0.3673469388

Combine like terms: 0 + 0.3673469388 = 0.3673469388
-3.87755102t + t2 = 0.3673469388

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 = 0.3673469388 + 3.758850478

Reorder the terms:
3.758850478 + -3.87755102t + t2 = 0.3673469388 + 3.758850478

Combine like terms: 0.3673469388 + 3.758850478 = 4.1261974168
3.758850478 + -3.87755102t + t2 = 4.1261974168

Factor a perfect square on the left side:
(t + -1.93877551)(t + -1.93877551) = 4.1261974168

Calculate the square root of the right side: 2.031304363

Break this problem into two subproblems by setting 
(t + -1.93877551) equal to 2.031304363 and -2.031304363.

Subproblem 1

t + -1.93877551 = 2.031304363 Simplifying t + -1.93877551 = 2.031304363 Reorder the terms: -1.93877551 + t = 2.031304363 Solving -1.93877551 + t = 2.031304363 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 = 2.031304363 + 1.93877551 Combine like terms: -1.93877551 + 1.93877551 = 0.00000000 0.00000000 + t = 2.031304363 + 1.93877551 t = 2.031304363 + 1.93877551 Combine like terms: 2.031304363 + 1.93877551 = 3.970079873 t = 3.970079873 Simplifying t = 3.970079873

Subproblem 2

t + -1.93877551 = -2.031304363 Simplifying t + -1.93877551 = -2.031304363 Reorder the terms: -1.93877551 + t = -2.031304363 Solving -1.93877551 + t = -2.031304363 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 = -2.031304363 + 1.93877551 Combine like terms: -1.93877551 + 1.93877551 = 0.00000000 0.00000000 + t = -2.031304363 + 1.93877551 t = -2.031304363 + 1.93877551 Combine like terms: -2.031304363 + 1.93877551 = -0.092528853 t = -0.092528853 Simplifying t = -0.092528853

Solution

The solution to the problem is based on the solutions from the subproblems. t = {3.970079873, -0.092528853}

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