-100=(50)t-(0.5)(9.81)t^2

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Solution for -100=(50)t-(0.5)(9.81)t^2 equation:


Simplifying
-100 = (50) * t + -1(0.5)(9.81) * t2

Multiply -1 * 0.5
-100 = 50t + -0.5 * 9.81t2

Multiply -0.5 * 9.81
-100 = 50t + -4.905t2

Solving
-100 = 50t + -4.905t2

Solving for variable 't'.

Reorder the terms:
-100 + -50t + 4.905t2 = 50t + -50t + -4.905t2 + 4.905t2

Combine like terms: 50t + -50t = 0
-100 + -50t + 4.905t2 = 0 + -4.905t2 + 4.905t2
-100 + -50t + 4.905t2 = -4.905t2 + 4.905t2

Combine like terms: -4.905t2 + 4.905t2 = 0.000
-100 + -50t + 4.905t2 = 0.000

Begin completing the square.  Divide all terms by
4.905 the coefficient of the squared term: 

Divide each side by '4.905'.
-20.38735984 + -10.19367992t + t2 = 0

Move the constant term to the right:

Add '20.38735984' to each side of the equation.
-20.38735984 + -10.19367992t + 20.38735984 + t2 = 0 + 20.38735984

Reorder the terms:
-20.38735984 + 20.38735984 + -10.19367992t + t2 = 0 + 20.38735984

Combine like terms: -20.38735984 + 20.38735984 = 0.00000000
0.00000000 + -10.19367992t + t2 = 0 + 20.38735984
-10.19367992t + t2 = 0 + 20.38735984

Combine like terms: 0 + 20.38735984 = 20.38735984
-10.19367992t + t2 = 20.38735984

The t term is -10.19367992t.  Take half its coefficient (-5.09683996).
Square it (25.97777758) and add it to both sides.

Add '25.97777758' to each side of the equation.
-10.19367992t + 25.97777758 + t2 = 20.38735984 + 25.97777758

Reorder the terms:
25.97777758 + -10.19367992t + t2 = 20.38735984 + 25.97777758

Combine like terms: 20.38735984 + 25.97777758 = 46.36513742
25.97777758 + -10.19367992t + t2 = 46.36513742

Factor a perfect square on the left side:
(t + -5.09683996)(t + -5.09683996) = 46.36513742

Calculate the square root of the right side: 6.809195064

Break this problem into two subproblems by setting 
(t + -5.09683996) equal to 6.809195064 and -6.809195064.

Subproblem 1

t + -5.09683996 = 6.809195064 Simplifying t + -5.09683996 = 6.809195064 Reorder the terms: -5.09683996 + t = 6.809195064 Solving -5.09683996 + t = 6.809195064 Solving for variable 't'. Move all terms containing t to the left, all other terms to the right. Add '5.09683996' to each side of the equation. -5.09683996 + 5.09683996 + t = 6.809195064 + 5.09683996 Combine like terms: -5.09683996 + 5.09683996 = 0.00000000 0.00000000 + t = 6.809195064 + 5.09683996 t = 6.809195064 + 5.09683996 Combine like terms: 6.809195064 + 5.09683996 = 11.906035024 t = 11.906035024 Simplifying t = 11.906035024

Subproblem 2

t + -5.09683996 = -6.809195064 Simplifying t + -5.09683996 = -6.809195064 Reorder the terms: -5.09683996 + t = -6.809195064 Solving -5.09683996 + t = -6.809195064 Solving for variable 't'. Move all terms containing t to the left, all other terms to the right. Add '5.09683996' to each side of the equation. -5.09683996 + 5.09683996 + t = -6.809195064 + 5.09683996 Combine like terms: -5.09683996 + 5.09683996 = 0.00000000 0.00000000 + t = -6.809195064 + 5.09683996 t = -6.809195064 + 5.09683996 Combine like terms: -6.809195064 + 5.09683996 = -1.712355104 t = -1.712355104 Simplifying t = -1.712355104

Solution

The solution to the problem is based on the solutions from the subproblems. t = {11.906035024, -1.712355104}

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