0=-4.9t^2+25t+12

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Solution for 0=-4.9t^2+25t+12 equation:


Simplifying
0 = -4.9t2 + 25t + 12

Reorder the terms:
0 = 12 + 25t + -4.9t2

Solving
0 = 12 + 25t + -4.9t2

Solving for variable 't'.

Combine like terms: 0 + -12 = -12
-12 + -25t + 4.9t2 = 12 + 25t + -4.9t2 + -12 + -25t + 4.9t2

Reorder the terms:
-12 + -25t + 4.9t2 = 12 + -12 + 25t + -25t + -4.9t2 + 4.9t2

Combine like terms: 12 + -12 = 0
-12 + -25t + 4.9t2 = 0 + 25t + -25t + -4.9t2 + 4.9t2
-12 + -25t + 4.9t2 = 25t + -25t + -4.9t2 + 4.9t2

Combine like terms: 25t + -25t = 0
-12 + -25t + 4.9t2 = 0 + -4.9t2 + 4.9t2
-12 + -25t + 4.9t2 = -4.9t2 + 4.9t2

Combine like terms: -4.9t2 + 4.9t2 = 0.0
-12 + -25t + 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 + -5.102040816t + t2 = 0

Move the constant term to the right:

Add '2.448979592' to each side of the equation.
-2.448979592 + -5.102040816t + 2.448979592 + t2 = 0 + 2.448979592

Reorder the terms:
-2.448979592 + 2.448979592 + -5.102040816t + t2 = 0 + 2.448979592

Combine like terms: -2.448979592 + 2.448979592 = 0.000000000
0.000000000 + -5.102040816t + t2 = 0 + 2.448979592
-5.102040816t + t2 = 0 + 2.448979592

Combine like terms: 0 + 2.448979592 = 2.448979592
-5.102040816t + t2 = 2.448979592

The t term is -5.102040816t.  Take half its coefficient (-2.551020408).
Square it (6.507705122) and add it to both sides.

Add '6.507705122' to each side of the equation.
-5.102040816t + 6.507705122 + t2 = 2.448979592 + 6.507705122

Reorder the terms:
6.507705122 + -5.102040816t + t2 = 2.448979592 + 6.507705122

Combine like terms: 2.448979592 + 6.507705122 = 8.956684714
6.507705122 + -5.102040816t + t2 = 8.956684714

Factor a perfect square on the left side:
(t + -2.551020408)(t + -2.551020408) = 8.956684714

Calculate the square root of the right side: 2.992772079

Break this problem into two subproblems by setting 
(t + -2.551020408) equal to 2.992772079 and -2.992772079.

Subproblem 1

t + -2.551020408 = 2.992772079 Simplifying t + -2.551020408 = 2.992772079 Reorder the terms: -2.551020408 + t = 2.992772079 Solving -2.551020408 + t = 2.992772079 Solving for variable 't'. Move all terms containing t to the left, all other terms to the right. Add '2.551020408' to each side of the equation. -2.551020408 + 2.551020408 + t = 2.992772079 + 2.551020408 Combine like terms: -2.551020408 + 2.551020408 = 0.000000000 0.000000000 + t = 2.992772079 + 2.551020408 t = 2.992772079 + 2.551020408 Combine like terms: 2.992772079 + 2.551020408 = 5.543792487 t = 5.543792487 Simplifying t = 5.543792487

Subproblem 2

t + -2.551020408 = -2.992772079 Simplifying t + -2.551020408 = -2.992772079 Reorder the terms: -2.551020408 + t = -2.992772079 Solving -2.551020408 + t = -2.992772079 Solving for variable 't'. Move all terms containing t to the left, all other terms to the right. Add '2.551020408' to each side of the equation. -2.551020408 + 2.551020408 + t = -2.992772079 + 2.551020408 Combine like terms: -2.551020408 + 2.551020408 = 0.000000000 0.000000000 + t = -2.992772079 + 2.551020408 t = -2.992772079 + 2.551020408 Combine like terms: -2.992772079 + 2.551020408 = -0.441751671 t = -0.441751671 Simplifying t = -0.441751671

Solution

The solution to the problem is based on the solutions from the subproblems. t = {5.543792487, -0.441751671}

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