-80=12t-4.9t^2

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Solution for -80=12t-4.9t^2 equation:


Simplifying
-80 = 12t + -4.9t2

Solving
-80 = 12t + -4.9t2

Solving for variable 't'.

Reorder the terms:
-80 + -12t + 4.9t2 = 12t + -12t + -4.9t2 + 4.9t2

Combine like terms: 12t + -12t = 0
-80 + -12t + 4.9t2 = 0 + -4.9t2 + 4.9t2
-80 + -12t + 4.9t2 = -4.9t2 + 4.9t2

Combine like terms: -4.9t2 + 4.9t2 = 0.0
-80 + -12t + 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'.
-16.32653061 + -2.448979592t + t2 = 0

Move the constant term to the right:

Add '16.32653061' to each side of the equation.
-16.32653061 + -2.448979592t + 16.32653061 + t2 = 0 + 16.32653061

Reorder the terms:
-16.32653061 + 16.32653061 + -2.448979592t + t2 = 0 + 16.32653061

Combine like terms: -16.32653061 + 16.32653061 = 0.00000000
0.00000000 + -2.448979592t + t2 = 0 + 16.32653061
-2.448979592t + t2 = 0 + 16.32653061

Combine like terms: 0 + 16.32653061 = 16.32653061
-2.448979592t + t2 = 16.32653061

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 = 16.32653061 + 1.499375261

Reorder the terms:
1.499375261 + -2.448979592t + t2 = 16.32653061 + 1.499375261

Combine like terms: 16.32653061 + 1.499375261 = 17.825905871
1.499375261 + -2.448979592t + t2 = 17.825905871

Factor a perfect square on the left side:
(t + -1.224489796)(t + -1.224489796) = 17.825905871

Calculate the square root of the right side: 4.222073646

Break this problem into two subproblems by setting 
(t + -1.224489796) equal to 4.222073646 and -4.222073646.

Subproblem 1

t + -1.224489796 = 4.222073646 Simplifying t + -1.224489796 = 4.222073646 Reorder the terms: -1.224489796 + t = 4.222073646 Solving -1.224489796 + t = 4.222073646 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 = 4.222073646 + 1.224489796 Combine like terms: -1.224489796 + 1.224489796 = 0.000000000 0.000000000 + t = 4.222073646 + 1.224489796 t = 4.222073646 + 1.224489796 Combine like terms: 4.222073646 + 1.224489796 = 5.446563442 t = 5.446563442 Simplifying t = 5.446563442

Subproblem 2

t + -1.224489796 = -4.222073646 Simplifying t + -1.224489796 = -4.222073646 Reorder the terms: -1.224489796 + t = -4.222073646 Solving -1.224489796 + t = -4.222073646 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 = -4.222073646 + 1.224489796 Combine like terms: -1.224489796 + 1.224489796 = 0.000000000 0.000000000 + t = -4.222073646 + 1.224489796 t = -4.222073646 + 1.224489796 Combine like terms: -4.222073646 + 1.224489796 = -2.99758385 t = -2.99758385 Simplifying t = -2.99758385

Solution

The solution to the problem is based on the solutions from the subproblems. t = {5.446563442, -2.99758385}

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