2t^2-4t-5=0

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Solution for 2t^2-4t-5=0 equation:


Simplifying
2t2 + -4t + -5 = 0

Reorder the terms:
-5 + -4t + 2t2 = 0

Solving
-5 + -4t + 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'.
-2.5 + -2t + t2 = 0

Move the constant term to the right:

Add '2.5' to each side of the equation.
-2.5 + -2t + 2.5 + t2 = 0 + 2.5

Reorder the terms:
-2.5 + 2.5 + -2t + t2 = 0 + 2.5

Combine like terms: -2.5 + 2.5 = 0.0
0.0 + -2t + t2 = 0 + 2.5
-2t + t2 = 0 + 2.5

Combine like terms: 0 + 2.5 = 2.5
-2t + t2 = 2.5

The t term is -2t.  Take half its coefficient (-1).
Square it (1) and add it to both sides.

Add '1' to each side of the equation.
-2t + 1 + t2 = 2.5 + 1

Reorder the terms:
1 + -2t + t2 = 2.5 + 1

Combine like terms: 2.5 + 1 = 3.5
1 + -2t + t2 = 3.5

Factor a perfect square on the left side:
(t + -1)(t + -1) = 3.5

Calculate the square root of the right side: 1.870828693

Break this problem into two subproblems by setting 
(t + -1) equal to 1.870828693 and -1.870828693.

Subproblem 1

t + -1 = 1.870828693 Simplifying t + -1 = 1.870828693 Reorder the terms: -1 + t = 1.870828693 Solving -1 + t = 1.870828693 Solving for variable 't'. Move all terms containing t to the left, all other terms to the right. Add '1' to each side of the equation. -1 + 1 + t = 1.870828693 + 1 Combine like terms: -1 + 1 = 0 0 + t = 1.870828693 + 1 t = 1.870828693 + 1 Combine like terms: 1.870828693 + 1 = 2.870828693 t = 2.870828693 Simplifying t = 2.870828693

Subproblem 2

t + -1 = -1.870828693 Simplifying t + -1 = -1.870828693 Reorder the terms: -1 + t = -1.870828693 Solving -1 + t = -1.870828693 Solving for variable 't'. Move all terms containing t to the left, all other terms to the right. Add '1' to each side of the equation. -1 + 1 + t = -1.870828693 + 1 Combine like terms: -1 + 1 = 0 0 + t = -1.870828693 + 1 t = -1.870828693 + 1 Combine like terms: -1.870828693 + 1 = -0.870828693 t = -0.870828693 Simplifying t = -0.870828693

Solution

The solution to the problem is based on the solutions from the subproblems. t = {2.870828693, -0.870828693}

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