4.9*(t^2)-12*t-55=0

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Solution for 4.9*(t^2)-12*t-55=0 equation:


Simplifying
4.9(t2) + -12t + -55 = 0

Reorder the terms:
-55 + -12t + 4.9t2 = 0

Solving
-55 + -12t + 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 + -2.448979592t + t2 = 0

Move the constant term to the right:

Add '11.2244898' to each side of the equation.
-11.2244898 + -2.448979592t + 11.2244898 + t2 = 0 + 11.2244898

Reorder the terms:
-11.2244898 + 11.2244898 + -2.448979592t + t2 = 0 + 11.2244898

Combine like terms: -11.2244898 + 11.2244898 = 0.0000000
0.0000000 + -2.448979592t + t2 = 0 + 11.2244898
-2.448979592t + t2 = 0 + 11.2244898

Combine like terms: 0 + 11.2244898 = 11.2244898
-2.448979592t + t2 = 11.2244898

The t term is -2.448979592t.  Take half its coefficient (-1.224489796).
Square it (1.499375261) and add it to both sides.

Add '1.499375261' to each side of the equation.
-2.448979592t + 1.499375261 + t2 = 11.2244898 + 1.499375261

Reorder the terms:
1.499375261 + -2.448979592t + t2 = 11.2244898 + 1.499375261

Combine like terms: 11.2244898 + 1.499375261 = 12.723865061
1.499375261 + -2.448979592t + t2 = 12.723865061

Factor a perfect square on the left side:
(t + -1.224489796)(t + -1.224489796) = 12.723865061

Calculate the square root of the right side: 3.567052714

Break this problem into two subproblems by setting 
(t + -1.224489796) equal to 3.567052714 and -3.567052714.

Subproblem 1

t + -1.224489796 = 3.567052714 Simplifying t + -1.224489796 = 3.567052714 Reorder the terms: -1.224489796 + t = 3.567052714 Solving -1.224489796 + t = 3.567052714 Solving for variable 't'. Move all terms containing t to the left, all other terms to the right. Add '1.224489796' to each side of the equation. -1.224489796 + 1.224489796 + t = 3.567052714 + 1.224489796 Combine like terms: -1.224489796 + 1.224489796 = 0.000000000 0.000000000 + t = 3.567052714 + 1.224489796 t = 3.567052714 + 1.224489796 Combine like terms: 3.567052714 + 1.224489796 = 4.79154251 t = 4.79154251 Simplifying t = 4.79154251

Subproblem 2

t + -1.224489796 = -3.567052714 Simplifying t + -1.224489796 = -3.567052714 Reorder the terms: -1.224489796 + t = -3.567052714 Solving -1.224489796 + t = -3.567052714 Solving for variable 't'. Move all terms containing t to the left, all other terms to the right. Add '1.224489796' to each side of the equation. -1.224489796 + 1.224489796 + t = -3.567052714 + 1.224489796 Combine like terms: -1.224489796 + 1.224489796 = 0.000000000 0.000000000 + t = -3.567052714 + 1.224489796 t = -3.567052714 + 1.224489796 Combine like terms: -3.567052714 + 1.224489796 = -2.342562918 t = -2.342562918 Simplifying t = -2.342562918

Solution

The solution to the problem is based on the solutions from the subproblems. t = {4.79154251, -2.342562918}

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