100=20t-.5t^2

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Solution for 100=20t-.5t^2 equation:


Simplifying
100 = 20t + -0.5t2

Solving
100 = 20t + -0.5t2

Solving for variable 't'.

Reorder the terms:
100 + -20t + 0.5t2 = 20t + -20t + -0.5t2 + 0.5t2

Combine like terms: 20t + -20t = 0
100 + -20t + 0.5t2 = 0 + -0.5t2 + 0.5t2
100 + -20t + 0.5t2 = -0.5t2 + 0.5t2

Combine like terms: -0.5t2 + 0.5t2 = 0.0
100 + -20t + 0.5t2 = 0.0

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

Divide each side by '0.5'.
200 + -40t + t2 = 0

Move the constant term to the right:

Add '-200' to each side of the equation.
200 + -40t + -200 + t2 = 0 + -200

Reorder the terms:
200 + -200 + -40t + t2 = 0 + -200

Combine like terms: 200 + -200 = 0
0 + -40t + t2 = 0 + -200
-40t + t2 = 0 + -200

Combine like terms: 0 + -200 = -200
-40t + t2 = -200

The t term is -40t.  Take half its coefficient (-20).
Square it (400) and add it to both sides.

Add '400' to each side of the equation.
-40t + 400 + t2 = -200 + 400

Reorder the terms:
400 + -40t + t2 = -200 + 400

Combine like terms: -200 + 400 = 200
400 + -40t + t2 = 200

Factor a perfect square on the left side:
(t + -20)(t + -20) = 200

Calculate the square root of the right side: 14.142135624

Break this problem into two subproblems by setting 
(t + -20) equal to 14.142135624 and -14.142135624.

Subproblem 1

t + -20 = 14.142135624 Simplifying t + -20 = 14.142135624 Reorder the terms: -20 + t = 14.142135624 Solving -20 + t = 14.142135624 Solving for variable 't'. Move all terms containing t to the left, all other terms to the right. Add '20' to each side of the equation. -20 + 20 + t = 14.142135624 + 20 Combine like terms: -20 + 20 = 0 0 + t = 14.142135624 + 20 t = 14.142135624 + 20 Combine like terms: 14.142135624 + 20 = 34.142135624 t = 34.142135624 Simplifying t = 34.142135624

Subproblem 2

t + -20 = -14.142135624 Simplifying t + -20 = -14.142135624 Reorder the terms: -20 + t = -14.142135624 Solving -20 + t = -14.142135624 Solving for variable 't'. Move all terms containing t to the left, all other terms to the right. Add '20' to each side of the equation. -20 + 20 + t = -14.142135624 + 20 Combine like terms: -20 + 20 = 0 0 + t = -14.142135624 + 20 t = -14.142135624 + 20 Combine like terms: -14.142135624 + 20 = 5.857864376 t = 5.857864376 Simplifying t = 5.857864376

Solution

The solution to the problem is based on the solutions from the subproblems. t = {34.142135624, 5.857864376}

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