100=15(t)+4.9t^2

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Solution for 100=15(t)+4.9t^2 equation:


Simplifying
100 = 15(t) + 4.9t2

Solving
100 = 15t + 4.9t2

Solving for variable 't'.

Reorder the terms:
100 + -15t + -4.9t2 = 15t + -15t + 4.9t2 + -4.9t2

Combine like terms: 15t + -15t = 0
100 + -15t + -4.9t2 = 0 + 4.9t2 + -4.9t2
100 + -15t + -4.9t2 = 4.9t2 + -4.9t2

Combine like terms: 4.9t2 + -4.9t2 = 0.0
100 + -15t + -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'.
-20.40816327 + 3.06122449t + t2 = 0

Move the constant term to the right:

Add '20.40816327' to each side of the equation.
-20.40816327 + 3.06122449t + 20.40816327 + t2 = 0 + 20.40816327

Reorder the terms:
-20.40816327 + 20.40816327 + 3.06122449t + t2 = 0 + 20.40816327

Combine like terms: -20.40816327 + 20.40816327 = 0.00000000
0.00000000 + 3.06122449t + t2 = 0 + 20.40816327
3.06122449t + t2 = 0 + 20.40816327

Combine like terms: 0 + 20.40816327 = 20.40816327
3.06122449t + t2 = 20.40816327

The t term is 3.06122449t.  Take half its coefficient (1.530612245).
Square it (2.342773845) and add it to both sides.

Add '2.342773845' to each side of the equation.
3.06122449t + 2.342773845 + t2 = 20.40816327 + 2.342773845

Reorder the terms:
2.342773845 + 3.06122449t + t2 = 20.40816327 + 2.342773845

Combine like terms: 20.40816327 + 2.342773845 = 22.750937115
2.342773845 + 3.06122449t + t2 = 22.750937115

Factor a perfect square on the left side:
(t + 1.530612245)(t + 1.530612245) = 22.750937115

Calculate the square root of the right side: 4.769794242

Break this problem into two subproblems by setting 
(t + 1.530612245) equal to 4.769794242 and -4.769794242.

Subproblem 1

t + 1.530612245 = 4.769794242 Simplifying t + 1.530612245 = 4.769794242 Reorder the terms: 1.530612245 + t = 4.769794242 Solving 1.530612245 + t = 4.769794242 Solving for variable 't'. Move all terms containing t to the left, all other terms to the right. Add '-1.530612245' to each side of the equation. 1.530612245 + -1.530612245 + t = 4.769794242 + -1.530612245 Combine like terms: 1.530612245 + -1.530612245 = 0.000000000 0.000000000 + t = 4.769794242 + -1.530612245 t = 4.769794242 + -1.530612245 Combine like terms: 4.769794242 + -1.530612245 = 3.239181997 t = 3.239181997 Simplifying t = 3.239181997

Subproblem 2

t + 1.530612245 = -4.769794242 Simplifying t + 1.530612245 = -4.769794242 Reorder the terms: 1.530612245 + t = -4.769794242 Solving 1.530612245 + t = -4.769794242 Solving for variable 't'. Move all terms containing t to the left, all other terms to the right. Add '-1.530612245' to each side of the equation. 1.530612245 + -1.530612245 + t = -4.769794242 + -1.530612245 Combine like terms: 1.530612245 + -1.530612245 = 0.000000000 0.000000000 + t = -4.769794242 + -1.530612245 t = -4.769794242 + -1.530612245 Combine like terms: -4.769794242 + -1.530612245 = -6.300406487 t = -6.300406487 Simplifying t = -6.300406487

Solution

The solution to the problem is based on the solutions from the subproblems. t = {3.239181997, -6.300406487}

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