-2=15t+4.9t^2

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Solution for -2=15t+4.9t^2 equation:


Simplifying
-2 = 15t + 4.9t2

Solving
-2 = 15t + 4.9t2

Solving for variable 't'.

Reorder the terms:
-2 + -15t + -4.9t2 = 15t + -15t + 4.9t2 + -4.9t2

Combine like terms: 15t + -15t = 0
-2 + -15t + -4.9t2 = 0 + 4.9t2 + -4.9t2
-2 + -15t + -4.9t2 = 4.9t2 + -4.9t2

Combine like terms: 4.9t2 + -4.9t2 = 0.0
-2 + -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'.
0.4081632653 + 3.06122449t + t2 = 0

Move the constant term to the right:

Add '-0.4081632653' to each side of the equation.
0.4081632653 + 3.06122449t + -0.4081632653 + t2 = 0 + -0.4081632653

Reorder the terms:
0.4081632653 + -0.4081632653 + 3.06122449t + t2 = 0 + -0.4081632653

Combine like terms: 0.4081632653 + -0.4081632653 = 0.0000000000
0.0000000000 + 3.06122449t + t2 = 0 + -0.4081632653
3.06122449t + t2 = 0 + -0.4081632653

Combine like terms: 0 + -0.4081632653 = -0.4081632653
3.06122449t + t2 = -0.4081632653

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 = -0.4081632653 + 2.342773845

Reorder the terms:
2.342773845 + 3.06122449t + t2 = -0.4081632653 + 2.342773845

Combine like terms: -0.4081632653 + 2.342773845 = 1.9346105797
2.342773845 + 3.06122449t + t2 = 1.9346105797

Factor a perfect square on the left side:
(t + 1.530612245)(t + 1.530612245) = 1.9346105797

Calculate the square root of the right side: 1.390902793

Break this problem into two subproblems by setting 
(t + 1.530612245) equal to 1.390902793 and -1.390902793.

Subproblem 1

t + 1.530612245 = 1.390902793 Simplifying t + 1.530612245 = 1.390902793 Reorder the terms: 1.530612245 + t = 1.390902793 Solving 1.530612245 + t = 1.390902793 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 = 1.390902793 + -1.530612245 Combine like terms: 1.530612245 + -1.530612245 = 0.000000000 0.000000000 + t = 1.390902793 + -1.530612245 t = 1.390902793 + -1.530612245 Combine like terms: 1.390902793 + -1.530612245 = -0.139709452 t = -0.139709452 Simplifying t = -0.139709452

Subproblem 2

t + 1.530612245 = -1.390902793 Simplifying t + 1.530612245 = -1.390902793 Reorder the terms: 1.530612245 + t = -1.390902793 Solving 1.530612245 + t = -1.390902793 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 = -1.390902793 + -1.530612245 Combine like terms: 1.530612245 + -1.530612245 = 0.000000000 0.000000000 + t = -1.390902793 + -1.530612245 t = -1.390902793 + -1.530612245 Combine like terms: -1.390902793 + -1.530612245 = -2.921515038 t = -2.921515038 Simplifying t = -2.921515038

Solution

The solution to the problem is based on the solutions from the subproblems. t = {-0.139709452, -2.921515038}

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