0=-4.9t^2+8t+10

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Solution for 0=-4.9t^2+8t+10 equation:


Simplifying
0 = -4.9t2 + 8t + 10

Reorder the terms:
0 = 10 + 8t + -4.9t2

Solving
0 = 10 + 8t + -4.9t2

Solving for variable 't'.

Combine like terms: 0 + -10 = -10
-10 + -8t + 4.9t2 = 10 + 8t + -4.9t2 + -10 + -8t + 4.9t2

Reorder the terms:
-10 + -8t + 4.9t2 = 10 + -10 + 8t + -8t + -4.9t2 + 4.9t2

Combine like terms: 10 + -10 = 0
-10 + -8t + 4.9t2 = 0 + 8t + -8t + -4.9t2 + 4.9t2
-10 + -8t + 4.9t2 = 8t + -8t + -4.9t2 + 4.9t2

Combine like terms: 8t + -8t = 0
-10 + -8t + 4.9t2 = 0 + -4.9t2 + 4.9t2
-10 + -8t + 4.9t2 = -4.9t2 + 4.9t2

Combine like terms: -4.9t2 + 4.9t2 = 0.0
-10 + -8t + 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'.
-2.040816327 + -1.632653061t + t2 = 0

Move the constant term to the right:

Add '2.040816327' to each side of the equation.
-2.040816327 + -1.632653061t + 2.040816327 + t2 = 0 + 2.040816327

Reorder the terms:
-2.040816327 + 2.040816327 + -1.632653061t + t2 = 0 + 2.040816327

Combine like terms: -2.040816327 + 2.040816327 = 0.000000000
0.000000000 + -1.632653061t + t2 = 0 + 2.040816327
-1.632653061t + t2 = 0 + 2.040816327

Combine like terms: 0 + 2.040816327 = 2.040816327
-1.632653061t + t2 = 2.040816327

The t term is -1.632653061t.  Take half its coefficient (-0.8163265305).
Square it (0.6663890044) and add it to both sides.

Add '0.6663890044' to each side of the equation.
-1.632653061t + 0.6663890044 + t2 = 2.040816327 + 0.6663890044

Reorder the terms:
0.6663890044 + -1.632653061t + t2 = 2.040816327 + 0.6663890044

Combine like terms: 2.040816327 + 0.6663890044 = 2.7072053314
0.6663890044 + -1.632653061t + t2 = 2.7072053314

Factor a perfect square on the left side:
(t + -0.8163265305)(t + -0.8163265305) = 2.7072053314

Calculate the square root of the right side: 1.645358724

Break this problem into two subproblems by setting 
(t + -0.8163265305) equal to 1.645358724 and -1.645358724.

Subproblem 1

t + -0.8163265305 = 1.645358724 Simplifying t + -0.8163265305 = 1.645358724 Reorder the terms: -0.8163265305 + t = 1.645358724 Solving -0.8163265305 + t = 1.645358724 Solving for variable 't'. Move all terms containing t to the left, all other terms to the right. Add '0.8163265305' to each side of the equation. -0.8163265305 + 0.8163265305 + t = 1.645358724 + 0.8163265305 Combine like terms: -0.8163265305 + 0.8163265305 = 0.0000000000 0.0000000000 + t = 1.645358724 + 0.8163265305 t = 1.645358724 + 0.8163265305 Combine like terms: 1.645358724 + 0.8163265305 = 2.4616852545 t = 2.4616852545 Simplifying t = 2.4616852545

Subproblem 2

t + -0.8163265305 = -1.645358724 Simplifying t + -0.8163265305 = -1.645358724 Reorder the terms: -0.8163265305 + t = -1.645358724 Solving -0.8163265305 + t = -1.645358724 Solving for variable 't'. Move all terms containing t to the left, all other terms to the right. Add '0.8163265305' to each side of the equation. -0.8163265305 + 0.8163265305 + t = -1.645358724 + 0.8163265305 Combine like terms: -0.8163265305 + 0.8163265305 = 0.0000000000 0.0000000000 + t = -1.645358724 + 0.8163265305 t = -1.645358724 + 0.8163265305 Combine like terms: -1.645358724 + 0.8163265305 = -0.8290321935 t = -0.8290321935 Simplifying t = -0.8290321935

Solution

The solution to the problem is based on the solutions from the subproblems. t = {2.4616852545, -0.8290321935}

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