0=4.9t^2+2t-100

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Solution for 0=4.9t^2+2t-100 equation:


Simplifying
0 = 4.9t2 + 2t + -100

Reorder the terms:
0 = -100 + 2t + 4.9t2

Solving
0 = -100 + 2t + 4.9t2

Solving for variable 't'.

Combine like terms: 0 + 100 = 100
100 + -2t + -4.9t2 = -100 + 2t + 4.9t2 + 100 + -2t + -4.9t2

Reorder the terms:
100 + -2t + -4.9t2 = -100 + 100 + 2t + -2t + 4.9t2 + -4.9t2

Combine like terms: -100 + 100 = 0
100 + -2t + -4.9t2 = 0 + 2t + -2t + 4.9t2 + -4.9t2
100 + -2t + -4.9t2 = 2t + -2t + 4.9t2 + -4.9t2

Combine like terms: 2t + -2t = 0
100 + -2t + -4.9t2 = 0 + 4.9t2 + -4.9t2
100 + -2t + -4.9t2 = 4.9t2 + -4.9t2

Combine like terms: 4.9t2 + -4.9t2 = 0.0
100 + -2t + -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'.
-20.40816327 + 0.4081632653t + t2 = 0

Move the constant term to the right:

Add '20.40816327' to each side of the equation.
-20.40816327 + 0.4081632653t + 20.40816327 + t2 = 0 + 20.40816327

Reorder the terms:
-20.40816327 + 20.40816327 + 0.4081632653t + t2 = 0 + 20.40816327

Combine like terms: -20.40816327 + 20.40816327 = 0.00000000
0.00000000 + 0.4081632653t + t2 = 0 + 20.40816327
0.4081632653t + t2 = 0 + 20.40816327

Combine like terms: 0 + 20.40816327 = 20.40816327
0.4081632653t + t2 = 20.40816327

The t term is 0.4081632653t.  Take half its coefficient (0.2040816327).
Square it (0.04164931281) and add it to both sides.

Add '0.04164931281' to each side of the equation.
0.4081632653t + 0.04164931281 + t2 = 20.40816327 + 0.04164931281

Reorder the terms:
0.04164931281 + 0.4081632653t + t2 = 20.40816327 + 0.04164931281

Combine like terms: 20.40816327 + 0.04164931281 = 20.44981258281
0.04164931281 + 0.4081632653t + t2 = 20.44981258281

Factor a perfect square on the left side:
(t + 0.2040816327)(t + 0.2040816327) = 20.44981258281

Calculate the square root of the right side: 4.5221469

Break this problem into two subproblems by setting 
(t + 0.2040816327) equal to 4.5221469 and -4.5221469.

Subproblem 1

t + 0.2040816327 = 4.5221469 Simplifying t + 0.2040816327 = 4.5221469 Reorder the terms: 0.2040816327 + t = 4.5221469 Solving 0.2040816327 + t = 4.5221469 Solving for variable 't'. Move all terms containing t to the left, all other terms to the right. Add '-0.2040816327' to each side of the equation. 0.2040816327 + -0.2040816327 + t = 4.5221469 + -0.2040816327 Combine like terms: 0.2040816327 + -0.2040816327 = 0.0000000000 0.0000000000 + t = 4.5221469 + -0.2040816327 t = 4.5221469 + -0.2040816327 Combine like terms: 4.5221469 + -0.2040816327 = 4.3180652673 t = 4.3180652673 Simplifying t = 4.3180652673

Subproblem 2

t + 0.2040816327 = -4.5221469 Simplifying t + 0.2040816327 = -4.5221469 Reorder the terms: 0.2040816327 + t = -4.5221469 Solving 0.2040816327 + t = -4.5221469 Solving for variable 't'. Move all terms containing t to the left, all other terms to the right. Add '-0.2040816327' to each side of the equation. 0.2040816327 + -0.2040816327 + t = -4.5221469 + -0.2040816327 Combine like terms: 0.2040816327 + -0.2040816327 = 0.0000000000 0.0000000000 + t = -4.5221469 + -0.2040816327 t = -4.5221469 + -0.2040816327 Combine like terms: -4.5221469 + -0.2040816327 = -4.7262285327 t = -4.7262285327 Simplifying t = -4.7262285327

Solution

The solution to the problem is based on the solutions from the subproblems. t = {4.3180652673, -4.7262285327}

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