8=50*t+-9.8*t^2

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Solution for 8=50*t+-9.8*t^2 equation:


Simplifying
8 = 50t + -9.8t2

Solving
8 = 50t + -9.8t2

Solving for variable 't'.

Reorder the terms:
8 + -50t + 9.8t2 = 50t + -50t + -9.8t2 + 9.8t2

Combine like terms: 50t + -50t = 0
8 + -50t + 9.8t2 = 0 + -9.8t2 + 9.8t2
8 + -50t + 9.8t2 = -9.8t2 + 9.8t2

Combine like terms: -9.8t2 + 9.8t2 = 0.0
8 + -50t + 9.8t2 = 0.0

Begin completing the square.  Divide all terms by
9.8 the coefficient of the squared term: 

Divide each side by '9.8'.
0.8163265306 + -5.102040816t + t2 = 0

Move the constant term to the right:

Add '-0.8163265306' to each side of the equation.
0.8163265306 + -5.102040816t + -0.8163265306 + t2 = 0 + -0.8163265306

Reorder the terms:
0.8163265306 + -0.8163265306 + -5.102040816t + t2 = 0 + -0.8163265306

Combine like terms: 0.8163265306 + -0.8163265306 = 0.0000000000
0.0000000000 + -5.102040816t + t2 = 0 + -0.8163265306
-5.102040816t + t2 = 0 + -0.8163265306

Combine like terms: 0 + -0.8163265306 = -0.8163265306
-5.102040816t + t2 = -0.8163265306

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 = -0.8163265306 + 6.507705122

Reorder the terms:
6.507705122 + -5.102040816t + t2 = -0.8163265306 + 6.507705122

Combine like terms: -0.8163265306 + 6.507705122 = 5.6913785914
6.507705122 + -5.102040816t + t2 = 5.6913785914

Factor a perfect square on the left side:
(t + -2.551020408)(t + -2.551020408) = 5.6913785914

Calculate the square root of the right side: 2.385661039

Break this problem into two subproblems by setting 
(t + -2.551020408) equal to 2.385661039 and -2.385661039.

Subproblem 1

t + -2.551020408 = 2.385661039 Simplifying t + -2.551020408 = 2.385661039 Reorder the terms: -2.551020408 + t = 2.385661039 Solving -2.551020408 + t = 2.385661039 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 = 2.385661039 + 2.551020408 Combine like terms: -2.551020408 + 2.551020408 = 0.000000000 0.000000000 + t = 2.385661039 + 2.551020408 t = 2.385661039 + 2.551020408 Combine like terms: 2.385661039 + 2.551020408 = 4.936681447 t = 4.936681447 Simplifying t = 4.936681447

Subproblem 2

t + -2.551020408 = -2.385661039 Simplifying t + -2.551020408 = -2.385661039 Reorder the terms: -2.551020408 + t = -2.385661039 Solving -2.551020408 + t = -2.385661039 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 = -2.385661039 + 2.551020408 Combine like terms: -2.551020408 + 2.551020408 = 0.000000000 0.000000000 + t = -2.385661039 + 2.551020408 t = -2.385661039 + 2.551020408 Combine like terms: -2.385661039 + 2.551020408 = 0.165359369 t = 0.165359369 Simplifying t = 0.165359369

Solution

The solution to the problem is based on the solutions from the subproblems. t = {4.936681447, 0.165359369}

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