100000=5t+.5(9.8)t^2

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Solution for 100000=5t+.5(9.8)t^2 equation:


Simplifying
100000 = 5t + 0.5(9.8) * t2

Multiply 0.5 * 9.8
100000 = 5t + 4.9t2

Solving
100000 = 5t + 4.9t2

Solving for variable 't'.

Reorder the terms:
100000 + -5t + -4.9t2 = 5t + -5t + 4.9t2 + -4.9t2

Combine like terms: 5t + -5t = 0
100000 + -5t + -4.9t2 = 0 + 4.9t2 + -4.9t2
100000 + -5t + -4.9t2 = 4.9t2 + -4.9t2

Combine like terms: 4.9t2 + -4.9t2 = 0.0
100000 + -5t + -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'.
-20408.16327 + 1.020408163t + t2 = 0

Move the constant term to the right:

Add '20408.16327' to each side of the equation.
-20408.16327 + 1.020408163t + 20408.16327 + t2 = 0 + 20408.16327

Reorder the terms:
-20408.16327 + 20408.16327 + 1.020408163t + t2 = 0 + 20408.16327

Combine like terms: -20408.16327 + 20408.16327 = 0.00000
0.00000 + 1.020408163t + t2 = 0 + 20408.16327
1.020408163t + t2 = 0 + 20408.16327

Combine like terms: 0 + 20408.16327 = 20408.16327
1.020408163t + t2 = 20408.16327

The t term is 1.020408163t.  Take half its coefficient (0.5102040815).
Square it (0.2603082048) and add it to both sides.

Add '0.2603082048' to each side of the equation.
1.020408163t + 0.2603082048 + t2 = 20408.16327 + 0.2603082048

Reorder the terms:
0.2603082048 + 1.020408163t + t2 = 20408.16327 + 0.2603082048

Combine like terms: 20408.16327 + 0.2603082048 = 20408.4235782048
0.2603082048 + 1.020408163t + t2 = 20408.4235782048

Factor a perfect square on the left side:
(t + 0.5102040815)(t + 0.5102040815) = 20408.4235782048

Calculate the square root of the right side: 142.858053949

Break this problem into two subproblems by setting 
(t + 0.5102040815) equal to 142.858053949 and -142.858053949.

Subproblem 1

t + 0.5102040815 = 142.858053949 Simplifying t + 0.5102040815 = 142.858053949 Reorder the terms: 0.5102040815 + t = 142.858053949 Solving 0.5102040815 + t = 142.858053949 Solving for variable 't'. Move all terms containing t to the left, all other terms to the right. Add '-0.5102040815' to each side of the equation. 0.5102040815 + -0.5102040815 + t = 142.858053949 + -0.5102040815 Combine like terms: 0.5102040815 + -0.5102040815 = 0.0000000000 0.0000000000 + t = 142.858053949 + -0.5102040815 t = 142.858053949 + -0.5102040815 Combine like terms: 142.858053949 + -0.5102040815 = 142.3478498675 t = 142.3478498675 Simplifying t = 142.3478498675

Subproblem 2

t + 0.5102040815 = -142.858053949 Simplifying t + 0.5102040815 = -142.858053949 Reorder the terms: 0.5102040815 + t = -142.858053949 Solving 0.5102040815 + t = -142.858053949 Solving for variable 't'. Move all terms containing t to the left, all other terms to the right. Add '-0.5102040815' to each side of the equation. 0.5102040815 + -0.5102040815 + t = -142.858053949 + -0.5102040815 Combine like terms: 0.5102040815 + -0.5102040815 = 0.0000000000 0.0000000000 + t = -142.858053949 + -0.5102040815 t = -142.858053949 + -0.5102040815 Combine like terms: -142.858053949 + -0.5102040815 = -143.3682580305 t = -143.3682580305 Simplifying t = -143.3682580305

Solution

The solution to the problem is based on the solutions from the subproblems. t = {142.3478498675, -143.3682580305}

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