0=-4.9t^2+30t+12

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Solution for 0=-4.9t^2+30t+12 equation:


Simplifying
0 = -4.9t2 + 30t + 12

Reorder the terms:
0 = 12 + 30t + -4.9t2

Solving
0 = 12 + 30t + -4.9t2

Solving for variable 't'.

Combine like terms: 0 + -12 = -12
-12 + -30t + 4.9t2 = 12 + 30t + -4.9t2 + -12 + -30t + 4.9t2

Reorder the terms:
-12 + -30t + 4.9t2 = 12 + -12 + 30t + -30t + -4.9t2 + 4.9t2

Combine like terms: 12 + -12 = 0
-12 + -30t + 4.9t2 = 0 + 30t + -30t + -4.9t2 + 4.9t2
-12 + -30t + 4.9t2 = 30t + -30t + -4.9t2 + 4.9t2

Combine like terms: 30t + -30t = 0
-12 + -30t + 4.9t2 = 0 + -4.9t2 + 4.9t2
-12 + -30t + 4.9t2 = -4.9t2 + 4.9t2

Combine like terms: -4.9t2 + 4.9t2 = 0.0
-12 + -30t + 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'.
-2.448979592 + -6.12244898t + t2 = 0

Move the constant term to the right:

Add '2.448979592' to each side of the equation.
-2.448979592 + -6.12244898t + 2.448979592 + t2 = 0 + 2.448979592

Reorder the terms:
-2.448979592 + 2.448979592 + -6.12244898t + t2 = 0 + 2.448979592

Combine like terms: -2.448979592 + 2.448979592 = 0.000000000
0.000000000 + -6.12244898t + t2 = 0 + 2.448979592
-6.12244898t + t2 = 0 + 2.448979592

Combine like terms: 0 + 2.448979592 = 2.448979592
-6.12244898t + t2 = 2.448979592

The t term is -6.12244898t.  Take half its coefficient (-3.06122449).
Square it (9.371095378) and add it to both sides.

Add '9.371095378' to each side of the equation.
-6.12244898t + 9.371095378 + t2 = 2.448979592 + 9.371095378

Reorder the terms:
9.371095378 + -6.12244898t + t2 = 2.448979592 + 9.371095378

Combine like terms: 2.448979592 + 9.371095378 = 11.82007497
9.371095378 + -6.12244898t + t2 = 11.82007497

Factor a perfect square on the left side:
(t + -3.06122449)(t + -3.06122449) = 11.82007497

Calculate the square root of the right side: 3.438033591

Break this problem into two subproblems by setting 
(t + -3.06122449) equal to 3.438033591 and -3.438033591.

Subproblem 1

t + -3.06122449 = 3.438033591 Simplifying t + -3.06122449 = 3.438033591 Reorder the terms: -3.06122449 + t = 3.438033591 Solving -3.06122449 + t = 3.438033591 Solving for variable 't'. Move all terms containing t to the left, all other terms to the right. Add '3.06122449' to each side of the equation. -3.06122449 + 3.06122449 + t = 3.438033591 + 3.06122449 Combine like terms: -3.06122449 + 3.06122449 = 0.00000000 0.00000000 + t = 3.438033591 + 3.06122449 t = 3.438033591 + 3.06122449 Combine like terms: 3.438033591 + 3.06122449 = 6.499258081 t = 6.499258081 Simplifying t = 6.499258081

Subproblem 2

t + -3.06122449 = -3.438033591 Simplifying t + -3.06122449 = -3.438033591 Reorder the terms: -3.06122449 + t = -3.438033591 Solving -3.06122449 + t = -3.438033591 Solving for variable 't'. Move all terms containing t to the left, all other terms to the right. Add '3.06122449' to each side of the equation. -3.06122449 + 3.06122449 + t = -3.438033591 + 3.06122449 Combine like terms: -3.06122449 + 3.06122449 = 0.00000000 0.00000000 + t = -3.438033591 + 3.06122449 t = -3.438033591 + 3.06122449 Combine like terms: -3.438033591 + 3.06122449 = -0.376809101 t = -0.376809101 Simplifying t = -0.376809101

Solution

The solution to the problem is based on the solutions from the subproblems. t = {6.499258081, -0.376809101}

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