-2t(t+2)=-3

Solution for -2t(t+2)=-3 equation:

Simplifying
-2t(t + 2) = -3

Reorder the terms:
-2t(2 + t) = -3
(2 * -2t + t * -2t) = -3
(-4t + -2t2) = -3

Solving
-4t + -2t2 = -3

Solving for variable 't'.

Reorder the terms:
3 + -4t + -2t2 = -3 + 3

Combine like terms: -3 + 3 = 0
3 + -4t + -2t2 = 0

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

Divide each side by '-2'.
-1.5 + 2t + t2 = 0

Move the constant term to the right:

Add '1.5' to each side of the equation.
-1.5 + 2t + 1.5 + t2 = 0 + 1.5

Reorder the terms:
-1.5 + 1.5 + 2t + t2 = 0 + 1.5

Combine like terms: -1.5 + 1.5 = 0.0
0.0 + 2t + t2 = 0 + 1.5
2t + t2 = 0 + 1.5

Combine like terms: 0 + 1.5 = 1.5
2t + t2 = 1.5

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 = 1.5 + 1

Reorder the terms:
1 + 2t + t2 = 1.5 + 1

Combine like terms: 1.5 + 1 = 2.5
1 + 2t + t2 = 2.5

Factor a perfect square on the left side:
(t + 1)(t + 1) = 2.5

Calculate the square root of the right side: 1.58113883

Break this problem into two subproblems by setting 
(t + 1) equal to 1.58113883 and -1.58113883.

Subproblem 1
t + 1 = 1.58113883

Simplifying
t + 1 = 1.58113883

Reorder the terms:
1 + t = 1.58113883

Solving
1 + t = 1.58113883

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 = 1.58113883 + -1

Combine like terms: 1 + -1 = 0
0 + t = 1.58113883 + -1
t = 1.58113883 + -1

Combine like terms: 1.58113883 + -1 = 0.58113883
t = 0.58113883

Simplifying
t = 0.58113883

Subproblem 2
t + 1 = -1.58113883

Simplifying
t + 1 = -1.58113883

Reorder the terms:
1 + t = -1.58113883

Solving
1 + t = -1.58113883

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 = -1.58113883 + -1

Combine like terms: 1 + -1 = 0
0 + t = -1.58113883 + -1
t = -1.58113883 + -1

Combine like terms: -1.58113883 + -1 = -2.58113883
t = -2.58113883

Simplifying
t = -2.58113883

Solution
The solution to the problem is based on the solutions
from the subproblems.
t = {0.58113883, -2.58113883}