4.9t^2-6t-100=0

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Solution for 4.9t^2-6t-100=0 equation:


Simplifying
4.9t2 + -6t + -100 = 0

Reorder the terms:
-100 + -6t + 4.9t2 = 0

Solving
-100 + -6t + 4.9t2 = 0

Solving for variable 't'.

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

Divide each side by '4.9'.
-20.40816327 + -1.224489796t + t2 = 0

Move the constant term to the right:

Add '20.40816327' to each side of the equation.
-20.40816327 + -1.224489796t + 20.40816327 + t2 = 0 + 20.40816327

Reorder the terms:
-20.40816327 + 20.40816327 + -1.224489796t + t2 = 0 + 20.40816327

Combine like terms: -20.40816327 + 20.40816327 = 0.00000000
0.00000000 + -1.224489796t + t2 = 0 + 20.40816327
-1.224489796t + t2 = 0 + 20.40816327

Combine like terms: 0 + 20.40816327 = 20.40816327
-1.224489796t + t2 = 20.40816327

The t term is -1.224489796t.  Take half its coefficient (-0.612244898).
Square it (0.3748438151) and add it to both sides.

Add '0.3748438151' to each side of the equation.
-1.224489796t + 0.3748438151 + t2 = 20.40816327 + 0.3748438151

Reorder the terms:
0.3748438151 + -1.224489796t + t2 = 20.40816327 + 0.3748438151

Combine like terms: 20.40816327 + 0.3748438151 = 20.7830070851
0.3748438151 + -1.224489796t + t2 = 20.7830070851

Factor a perfect square on the left side:
(t + -0.612244898)(t + -0.612244898) = 20.7830070851

Calculate the square root of the right side: 4.558838348

Break this problem into two subproblems by setting 
(t + -0.612244898) equal to 4.558838348 and -4.558838348.

Subproblem 1

t + -0.612244898 = 4.558838348 Simplifying t + -0.612244898 = 4.558838348 Reorder the terms: -0.612244898 + t = 4.558838348 Solving -0.612244898 + t = 4.558838348 Solving for variable 't'. Move all terms containing t to the left, all other terms to the right. Add '0.612244898' to each side of the equation. -0.612244898 + 0.612244898 + t = 4.558838348 + 0.612244898 Combine like terms: -0.612244898 + 0.612244898 = 0.000000000 0.000000000 + t = 4.558838348 + 0.612244898 t = 4.558838348 + 0.612244898 Combine like terms: 4.558838348 + 0.612244898 = 5.171083246 t = 5.171083246 Simplifying t = 5.171083246

Subproblem 2

t + -0.612244898 = -4.558838348 Simplifying t + -0.612244898 = -4.558838348 Reorder the terms: -0.612244898 + t = -4.558838348 Solving -0.612244898 + t = -4.558838348 Solving for variable 't'. Move all terms containing t to the left, all other terms to the right. Add '0.612244898' to each side of the equation. -0.612244898 + 0.612244898 + t = -4.558838348 + 0.612244898 Combine like terms: -0.612244898 + 0.612244898 = 0.000000000 0.000000000 + t = -4.558838348 + 0.612244898 t = -4.558838348 + 0.612244898 Combine like terms: -4.558838348 + 0.612244898 = -3.94659345 t = -3.94659345 Simplifying t = -3.94659345

Solution

The solution to the problem is based on the solutions from the subproblems. t = {5.171083246, -3.94659345}

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