55=t+4.9t^2

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Solution for 55=t+4.9t^2 equation:


Simplifying
55 = t + 4.9t2

Solving
55 = t + 4.9t2

Solving for variable 't'.

Reorder the terms:
55 + -1t + -4.9t2 = t + -1t + 4.9t2 + -4.9t2

Combine like terms: t + -1t = 0
55 + -1t + -4.9t2 = 0 + 4.9t2 + -4.9t2
55 + -1t + -4.9t2 = 4.9t2 + -4.9t2

Combine like terms: 4.9t2 + -4.9t2 = 0.0
55 + -1t + -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'.
-11.2244898 + 0.2040816327t + t2 = 0

Move the constant term to the right:

Add '11.2244898' to each side of the equation.
-11.2244898 + 0.2040816327t + 11.2244898 + t2 = 0 + 11.2244898

Reorder the terms:
-11.2244898 + 11.2244898 + 0.2040816327t + t2 = 0 + 11.2244898

Combine like terms: -11.2244898 + 11.2244898 = 0.0000000
0.0000000 + 0.2040816327t + t2 = 0 + 11.2244898
0.2040816327t + t2 = 0 + 11.2244898

Combine like terms: 0 + 11.2244898 = 11.2244898
0.2040816327t + t2 = 11.2244898

The t term is 0.2040816327t.  Take half its coefficient (0.1020408164).
Square it (0.01041232821) and add it to both sides.

Add '0.01041232821' to each side of the equation.
0.2040816327t + 0.01041232821 + t2 = 11.2244898 + 0.01041232821

Reorder the terms:
0.01041232821 + 0.2040816327t + t2 = 11.2244898 + 0.01041232821

Combine like terms: 11.2244898 + 0.01041232821 = 11.23490212821
0.01041232821 + 0.2040816327t + t2 = 11.23490212821

Factor a perfect square on the left side:
(t + 0.1020408164)(t + 0.1020408164) = 11.23490212821

Calculate the square root of the right side: 3.351850553

Break this problem into two subproblems by setting 
(t + 0.1020408164) equal to 3.351850553 and -3.351850553.

Subproblem 1

t + 0.1020408164 = 3.351850553 Simplifying t + 0.1020408164 = 3.351850553 Reorder the terms: 0.1020408164 + t = 3.351850553 Solving 0.1020408164 + t = 3.351850553 Solving for variable 't'. Move all terms containing t to the left, all other terms to the right. Add '-0.1020408164' to each side of the equation. 0.1020408164 + -0.1020408164 + t = 3.351850553 + -0.1020408164 Combine like terms: 0.1020408164 + -0.1020408164 = 0.0000000000 0.0000000000 + t = 3.351850553 + -0.1020408164 t = 3.351850553 + -0.1020408164 Combine like terms: 3.351850553 + -0.1020408164 = 3.2498097366 t = 3.2498097366 Simplifying t = 3.2498097366

Subproblem 2

t + 0.1020408164 = -3.351850553 Simplifying t + 0.1020408164 = -3.351850553 Reorder the terms: 0.1020408164 + t = -3.351850553 Solving 0.1020408164 + t = -3.351850553 Solving for variable 't'. Move all terms containing t to the left, all other terms to the right. Add '-0.1020408164' to each side of the equation. 0.1020408164 + -0.1020408164 + t = -3.351850553 + -0.1020408164 Combine like terms: 0.1020408164 + -0.1020408164 = 0.0000000000 0.0000000000 + t = -3.351850553 + -0.1020408164 t = -3.351850553 + -0.1020408164 Combine like terms: -3.351850553 + -0.1020408164 = -3.4538913694 t = -3.4538913694 Simplifying t = -3.4538913694

Solution

The solution to the problem is based on the solutions from the subproblems. t = {3.2498097366, -3.4538913694}

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