-4.9t^2+30.5t+9.8=0

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Solution for -4.9t^2+30.5t+9.8=0 equation:


Simplifying
-4.9t2 + 30.5t + 9.8 = 0

Reorder the terms:
9.8 + 30.5t + -4.9t2 = 0

Solving
9.8 + 30.5t + -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'.
-2 + -6.224489796t + t2 = 0

Move the constant term to the right:

Add '2' to each side of the equation.
-2 + -6.224489796t + 2 + t2 = 0 + 2

Reorder the terms:
-2 + 2 + -6.224489796t + t2 = 0 + 2

Combine like terms: -2 + 2 = 0
0 + -6.224489796t + t2 = 0 + 2
-6.224489796t + t2 = 0 + 2

Combine like terms: 0 + 2 = 2
-6.224489796t + t2 = 2

The t term is -6.224489796t.  Take half its coefficient (-3.112244898).
Square it (9.686068305) and add it to both sides.

Add '9.686068305' to each side of the equation.
-6.224489796t + 9.686068305 + t2 = 2 + 9.686068305

Reorder the terms:
9.686068305 + -6.224489796t + t2 = 2 + 9.686068305

Combine like terms: 2 + 9.686068305 = 11.686068305
9.686068305 + -6.224489796t + t2 = 11.686068305

Factor a perfect square on the left side:
(t + -3.112244898)(t + -3.112244898) = 11.686068305

Calculate the square root of the right side: 3.418489185

Break this problem into two subproblems by setting 
(t + -3.112244898) equal to 3.418489185 and -3.418489185.

Subproblem 1

t + -3.112244898 = 3.418489185 Simplifying t + -3.112244898 = 3.418489185 Reorder the terms: -3.112244898 + t = 3.418489185 Solving -3.112244898 + t = 3.418489185 Solving for variable 't'. Move all terms containing t to the left, all other terms to the right. Add '3.112244898' to each side of the equation. -3.112244898 + 3.112244898 + t = 3.418489185 + 3.112244898 Combine like terms: -3.112244898 + 3.112244898 = 0.000000000 0.000000000 + t = 3.418489185 + 3.112244898 t = 3.418489185 + 3.112244898 Combine like terms: 3.418489185 + 3.112244898 = 6.530734083 t = 6.530734083 Simplifying t = 6.530734083

Subproblem 2

t + -3.112244898 = -3.418489185 Simplifying t + -3.112244898 = -3.418489185 Reorder the terms: -3.112244898 + t = -3.418489185 Solving -3.112244898 + t = -3.418489185 Solving for variable 't'. Move all terms containing t to the left, all other terms to the right. Add '3.112244898' to each side of the equation. -3.112244898 + 3.112244898 + t = -3.418489185 + 3.112244898 Combine like terms: -3.112244898 + 3.112244898 = 0.000000000 0.000000000 + t = -3.418489185 + 3.112244898 t = -3.418489185 + 3.112244898 Combine like terms: -3.418489185 + 3.112244898 = -0.306244287 t = -0.306244287 Simplifying t = -0.306244287

Solution

The solution to the problem is based on the solutions from the subproblems. t = {6.530734083, -0.306244287}

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