-5t^2+10t+5=0

Solution for -5t^2+10t+5=0 equation:

Simplifying
-5t2 + 10t + 5 = 0

Reorder the terms:
5 + 10t + -5t2 = 0

Solving
5 + 10t + -5t2 = 0

Solving for variable 't'.

Factor out the Greatest Common Factor (GCF), '5'.
5(1 + 2t + -1t2) = 0

Ignore the factor 5.
Subproblem 1
Set the factor '(1 + 2t + -1t2)' equal to zero and attempt to solve:

Simplifying
1 + 2t + -1t2 = 0

Solving
1 + 2t + -1t2 = 0

Begin completing the square.  Divide all terms by
-1 the coefficient of the squared term: 

Divide each side by '-1'.
-1 + -2t + t2 = 0

Move the constant term to the right:

Add '1' to each side of the equation.
-1 + -2t + 1 + t2 = 0 + 1

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

Combine like terms: -1 + 1 = 0
0 + -2t + t2 = 0 + 1
-2t + t2 = 0 + 1

Combine like terms: 0 + 1 = 1
-2t + t2 = 1

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 = 1 + 1

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

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

Factor a perfect square on the left side:
(t + -1)(t + -1) = 2

Calculate the square root of the right side: 1.414213562

Break this problem into two subproblems by setting 
(t + -1) equal to 1.414213562 and -1.414213562.

Subproblem 1
t + -1 = 1.414213562

Simplifying
t + -1 = 1.414213562

Reorder the terms:
-1 + t = 1.414213562

Solving
-1 + t = 1.414213562

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 = 1.414213562 + 1

Combine like terms: -1 + 1 = 0
0 + t = 1.414213562 + 1
t = 1.414213562 + 1

Combine like terms: 1.414213562 + 1 = 2.414213562
t = 2.414213562

Simplifying
t = 2.414213562

Subproblem 2
t + -1 = -1.414213562

Simplifying
t + -1 = -1.414213562

Reorder the terms:
-1 + t = -1.414213562

Solving
-1 + t = -1.414213562

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 = -1.414213562 + 1

Combine like terms: -1 + 1 = 0
0 + t = -1.414213562 + 1
t = -1.414213562 + 1

Combine like terms: -1.414213562 + 1 = -0.414213562
t = -0.414213562

Simplifying
t = -0.414213562

Solution
The solution to the problem is based on the solutions
from the subproblems.
t = {2.414213562, -0.414213562}
Solution
t = {2.414213562, -0.414213562}