100=(400*t)+(0.5*(-2)*t^2)

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Solution for 100=(400*t)+(0.5*(-2)*t^2) equation:


Simplifying
100 = (400t) + (0.5(-2) * t2)

Multiply 0.5 * -2
100 = (400t) + (-1t2)

Solving
100 = (400t) + (-1t2)

Solving for variable 't'.
100 + (-400t) + t2 = (400t) + (-1t2) + (-400t) + (t2)
100 + (-400t) + t2 = (400t) + (-1t2) + (-400t) + t2

Reorder the terms:
100 + (-400t) + t2 = (400t) + (-400t) + (-1t2) + t2

Combine like terms: (400t) + (-400t) = 0
100 + (-400t) + t2 = 0 + (-1t2) + t2
100 + (-400t) + t2 = (-1t2) + t2

Combine like terms: (-1t2) + t2 = 0
100 + (-400t) + t2 = 0

Begin completing the square.

Move the constant term to the right:

Add '-100' to each side of the equation.
100 + (-400t) + -100 + t2 = 0 + -100

Reorder the terms:
100 + -100 + (-400t) + t2 = 0 + -100

Combine like terms: 100 + -100 = 0
0 + (-400t) + t2 = 0 + -100
(-400t) + t2 = 0 + -100

Combine like terms: 0 + -100 = -100
(-400t) + t2 = -100

The t term is (-400t).  Take half its coefficient (-200).
Square it (40000) and add it to both sides.

Add '40000' to each side of the equation.
(-400t) + 40000 + t2 = -100 + 40000

Reorder the terms:
40000 + (-400t) + t2 = -100 + 40000

Combine like terms: -100 + 40000 = 39900
40000 + (-400t) + t2 = 39900

Factor a perfect square on the left side:
(t + -200)(t + -200) = 39900

Calculate the square root of the right side: 199.749843554

Break this problem into two subproblems by setting 
(t + -200) equal to 199.749843554 and -199.749843554.

Subproblem 1

t + -200 = 199.749843554 Simplifying t + -200 = 199.749843554 Reorder the terms: -200 + t = 199.749843554 Solving -200 + t = 199.749843554 Solving for variable 't'. Move all terms containing t to the left, all other terms to the right. Add '200' to each side of the equation. -200 + 200 + t = 199.749843554 + 200 Combine like terms: -200 + 200 = 0 0 + t = 199.749843554 + 200 t = 199.749843554 + 200 Combine like terms: 199.749843554 + 200 = 399.749843554 t = 399.749843554 Simplifying t = 399.749843554

Subproblem 2

t + -200 = -199.749843554 Simplifying t + -200 = -199.749843554 Reorder the terms: -200 + t = -199.749843554 Solving -200 + t = -199.749843554 Solving for variable 't'. Move all terms containing t to the left, all other terms to the right. Add '200' to each side of the equation. -200 + 200 + t = -199.749843554 + 200 Combine like terms: -200 + 200 = 0 0 + t = -199.749843554 + 200 t = -199.749843554 + 200 Combine like terms: -199.749843554 + 200 = 0.250156446 t = 0.250156446 Simplifying t = 0.250156446

Solution

The solution to the problem is based on the solutions from the subproblems. t = {399.749843554, 0.250156446}

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