100=50t-0.5*9.81*t^2

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


Simplifying
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 = 5.59041774
25.97777758 + -10.19367992t + t2 = 5.59041774

Factor a perfect square on the left side:
(t + -5.09683996)(t + -5.09683996) = 5.59041774

Calculate the square root of the right side: 2.364406424

Break this problem into two subproblems by setting 
(t + -5.09683996) equal to 2.364406424 and -2.364406424.

Subproblem 1

t + -5.09683996 = 2.364406424 Simplifying t + -5.09683996 = 2.364406424 Reorder the terms: -5.09683996 + t = 2.364406424 Solving -5.09683996 + t = 2.364406424 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 = 2.364406424 + 5.09683996 Combine like terms: -5.09683996 + 5.09683996 = 0.00000000 0.00000000 + t = 2.364406424 + 5.09683996 t = 2.364406424 + 5.09683996 Combine like terms: 2.364406424 + 5.09683996 = 7.461246384 t = 7.461246384 Simplifying t = 7.461246384

Subproblem 2

t + -5.09683996 = -2.364406424 Simplifying t + -5.09683996 = -2.364406424 Reorder the terms: -5.09683996 + t = -2.364406424 Solving -5.09683996 + t = -2.364406424 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 = -2.364406424 + 5.09683996 Combine like terms: -5.09683996 + 5.09683996 = 0.00000000 0.00000000 + t = -2.364406424 + 5.09683996 t = -2.364406424 + 5.09683996 Combine like terms: -2.364406424 + 5.09683996 = 2.732433536 t = 2.732433536 Simplifying t = 2.732433536

Solution

The solution to the problem is based on the solutions from the subproblems. t = {7.461246384, 2.732433536}

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