0=4.9t^2+15t-92

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Solution for 0=4.9t^2+15t-92 equation:


Simplifying
0 = 4.9t2 + 15t + -92

Reorder the terms:
0 = -92 + 15t + 4.9t2

Solving
0 = -92 + 15t + 4.9t2

Solving for variable 't'.

Combine like terms: 0 + 92 = 92
92 + -15t + -4.9t2 = -92 + 15t + 4.9t2 + 92 + -15t + -4.9t2

Reorder the terms:
92 + -15t + -4.9t2 = -92 + 92 + 15t + -15t + 4.9t2 + -4.9t2

Combine like terms: -92 + 92 = 0
92 + -15t + -4.9t2 = 0 + 15t + -15t + 4.9t2 + -4.9t2
92 + -15t + -4.9t2 = 15t + -15t + 4.9t2 + -4.9t2

Combine like terms: 15t + -15t = 0
92 + -15t + -4.9t2 = 0 + 4.9t2 + -4.9t2
92 + -15t + -4.9t2 = 4.9t2 + -4.9t2

Combine like terms: 4.9t2 + -4.9t2 = 0.0
92 + -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'.
-18.7755102 + 3.06122449t + t2 = 0

Move the constant term to the right:

Add '18.7755102' to each side of the equation.
-18.7755102 + 3.06122449t + 18.7755102 + t2 = 0 + 18.7755102

Reorder the terms:
-18.7755102 + 18.7755102 + 3.06122449t + t2 = 0 + 18.7755102

Combine like terms: -18.7755102 + 18.7755102 = 0.0000000
0.0000000 + 3.06122449t + t2 = 0 + 18.7755102
3.06122449t + t2 = 0 + 18.7755102

Combine like terms: 0 + 18.7755102 = 18.7755102
3.06122449t + t2 = 18.7755102

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 = 18.7755102 + 2.342773845

Reorder the terms:
2.342773845 + 3.06122449t + t2 = 18.7755102 + 2.342773845

Combine like terms: 18.7755102 + 2.342773845 = 21.118284045
2.342773845 + 3.06122449t + t2 = 21.118284045

Factor a perfect square on the left side:
(t + 1.530612245)(t + 1.530612245) = 21.118284045

Calculate the square root of the right side: 4.59546342

Break this problem into two subproblems by setting 
(t + 1.530612245) equal to 4.59546342 and -4.59546342.

Subproblem 1

t + 1.530612245 = 4.59546342 Simplifying t + 1.530612245 = 4.59546342 Reorder the terms: 1.530612245 + t = 4.59546342 Solving 1.530612245 + t = 4.59546342 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 = 4.59546342 + -1.530612245 Combine like terms: 1.530612245 + -1.530612245 = 0.000000000 0.000000000 + t = 4.59546342 + -1.530612245 t = 4.59546342 + -1.530612245 Combine like terms: 4.59546342 + -1.530612245 = 3.064851175 t = 3.064851175 Simplifying t = 3.064851175

Subproblem 2

t + 1.530612245 = -4.59546342 Simplifying t + 1.530612245 = -4.59546342 Reorder the terms: 1.530612245 + t = -4.59546342 Solving 1.530612245 + t = -4.59546342 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 = -4.59546342 + -1.530612245 Combine like terms: 1.530612245 + -1.530612245 = 0.000000000 0.000000000 + t = -4.59546342 + -1.530612245 t = -4.59546342 + -1.530612245 Combine like terms: -4.59546342 + -1.530612245 = -6.126075665 t = -6.126075665 Simplifying t = -6.126075665

Solution

The solution to the problem is based on the solutions from the subproblems. t = {3.064851175, -6.126075665}

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