2t^2-20t-1=0

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Solution for 2t^2-20t-1=0 equation:


Simplifying
2t2 + -20t + -1 = 0

Reorder the terms:
-1 + -20t + 2t2 = 0

Solving
-1 + -20t + 2t2 = 0

Solving for variable 't'.

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

Divide each side by '2'.
-0.5 + -10t + t2 = 0

Move the constant term to the right:

Add '0.5' to each side of the equation.
-0.5 + -10t + 0.5 + t2 = 0 + 0.5

Reorder the terms:
-0.5 + 0.5 + -10t + t2 = 0 + 0.5

Combine like terms: -0.5 + 0.5 = 0.0
0.0 + -10t + t2 = 0 + 0.5
-10t + t2 = 0 + 0.5

Combine like terms: 0 + 0.5 = 0.5
-10t + t2 = 0.5

The t term is -10t.  Take half its coefficient (-5).
Square it (25) and add it to both sides.

Add '25' to each side of the equation.
-10t + 25 + t2 = 0.5 + 25

Reorder the terms:
25 + -10t + t2 = 0.5 + 25

Combine like terms: 0.5 + 25 = 25.5
25 + -10t + t2 = 25.5

Factor a perfect square on the left side:
(t + -5)(t + -5) = 25.5

Calculate the square root of the right side: 5.049752469

Break this problem into two subproblems by setting 
(t + -5) equal to 5.049752469 and -5.049752469.

Subproblem 1

t + -5 = 5.049752469 Simplifying t + -5 = 5.049752469 Reorder the terms: -5 + t = 5.049752469 Solving -5 + t = 5.049752469 Solving for variable 't'. Move all terms containing t to the left, all other terms to the right. Add '5' to each side of the equation. -5 + 5 + t = 5.049752469 + 5 Combine like terms: -5 + 5 = 0 0 + t = 5.049752469 + 5 t = 5.049752469 + 5 Combine like terms: 5.049752469 + 5 = 10.049752469 t = 10.049752469 Simplifying t = 10.049752469

Subproblem 2

t + -5 = -5.049752469 Simplifying t + -5 = -5.049752469 Reorder the terms: -5 + t = -5.049752469 Solving -5 + t = -5.049752469 Solving for variable 't'. Move all terms containing t to the left, all other terms to the right. Add '5' to each side of the equation. -5 + 5 + t = -5.049752469 + 5 Combine like terms: -5 + 5 = 0 0 + t = -5.049752469 + 5 t = -5.049752469 + 5 Combine like terms: -5.049752469 + 5 = -0.049752469 t = -0.049752469 Simplifying t = -0.049752469

Solution

The solution to the problem is based on the solutions from the subproblems. t = {10.049752469, -0.049752469}

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