4.9t^2+2.1t-55=0

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Solution for 4.9t^2+2.1t-55=0 equation:


Simplifying
4.9t2 + 2.1t + -55 = 0

Reorder the terms:
-55 + 2.1t + 4.9t2 = 0

Solving
-55 + 2.1t + 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'.
-11.2244898 + 0.4285714286t + t2 = 0

Move the constant term to the right:

Add '11.2244898' to each side of the equation.
-11.2244898 + 0.4285714286t + 11.2244898 + t2 = 0 + 11.2244898

Reorder the terms:
-11.2244898 + 11.2244898 + 0.4285714286t + t2 = 0 + 11.2244898

Combine like terms: -11.2244898 + 11.2244898 = 0.0000000
0.0000000 + 0.4285714286t + t2 = 0 + 11.2244898
0.4285714286t + t2 = 0 + 11.2244898

Combine like terms: 0 + 11.2244898 = 11.2244898
0.4285714286t + t2 = 11.2244898

The t term is 0.4285714286t.  Take half its coefficient (0.2142857143).
Square it (0.04591836735) and add it to both sides.

Add '0.04591836735' to each side of the equation.
0.4285714286t + 0.04591836735 + t2 = 11.2244898 + 0.04591836735

Reorder the terms:
0.04591836735 + 0.4285714286t + t2 = 11.2244898 + 0.04591836735

Combine like terms: 11.2244898 + 0.04591836735 = 11.27040816735
0.04591836735 + 0.4285714286t + t2 = 11.27040816735

Factor a perfect square on the left side:
(t + 0.2142857143)(t + 0.2142857143) = 11.27040816735

Calculate the square root of the right side: 3.357142858

Break this problem into two subproblems by setting 
(t + 0.2142857143) equal to 3.357142858 and -3.357142858.

Subproblem 1

t + 0.2142857143 = 3.357142858 Simplifying t + 0.2142857143 = 3.357142858 Reorder the terms: 0.2142857143 + t = 3.357142858 Solving 0.2142857143 + t = 3.357142858 Solving for variable 't'. Move all terms containing t to the left, all other terms to the right. Add '-0.2142857143' to each side of the equation. 0.2142857143 + -0.2142857143 + t = 3.357142858 + -0.2142857143 Combine like terms: 0.2142857143 + -0.2142857143 = 0.0000000000 0.0000000000 + t = 3.357142858 + -0.2142857143 t = 3.357142858 + -0.2142857143 Combine like terms: 3.357142858 + -0.2142857143 = 3.1428571437 t = 3.1428571437 Simplifying t = 3.1428571437

Subproblem 2

t + 0.2142857143 = -3.357142858 Simplifying t + 0.2142857143 = -3.357142858 Reorder the terms: 0.2142857143 + t = -3.357142858 Solving 0.2142857143 + t = -3.357142858 Solving for variable 't'. Move all terms containing t to the left, all other terms to the right. Add '-0.2142857143' to each side of the equation. 0.2142857143 + -0.2142857143 + t = -3.357142858 + -0.2142857143 Combine like terms: 0.2142857143 + -0.2142857143 = 0.0000000000 0.0000000000 + t = -3.357142858 + -0.2142857143 t = -3.357142858 + -0.2142857143 Combine like terms: -3.357142858 + -0.2142857143 = -3.5714285723 t = -3.5714285723 Simplifying t = -3.5714285723

Solution

The solution to the problem is based on the solutions from the subproblems. t = {3.1428571437, -3.5714285723}

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