-5t^2+18t+1.8=0

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Solution for -5t^2+18t+1.8=0 equation:


Simplifying
-5t2 + 18t + 1.8 = 0

Reorder the terms:
1.8 + 18t + -5t2 = 0

Solving
1.8 + 18t + -5t2 = 0

Solving for variable 't'.

Begin completing the square.  Divide all terms by
-5 the coefficient of the squared term: 

Divide each side by '-5'.
-0.36 + -3.6t + t2 = 0

Move the constant term to the right:

Add '0.36' to each side of the equation.
-0.36 + -3.6t + 0.36 + t2 = 0 + 0.36

Reorder the terms:
-0.36 + 0.36 + -3.6t + t2 = 0 + 0.36

Combine like terms: -0.36 + 0.36 = 0.00
0.00 + -3.6t + t2 = 0 + 0.36
-3.6t + t2 = 0 + 0.36

Combine like terms: 0 + 0.36 = 0.36
-3.6t + t2 = 0.36

The t term is -3.6t.  Take half its coefficient (-1.8).
Square it (3.24) and add it to both sides.

Add '3.24' to each side of the equation.
-3.6t + 3.24 + t2 = 0.36 + 3.24

Reorder the terms:
3.24 + -3.6t + t2 = 0.36 + 3.24

Combine like terms: 0.36 + 3.24 = 3.6
3.24 + -3.6t + t2 = 3.6

Factor a perfect square on the left side:
(t + -1.8)(t + -1.8) = 3.6

Calculate the square root of the right side: 1.897366596

Break this problem into two subproblems by setting 
(t + -1.8) equal to 1.897366596 and -1.897366596.

Subproblem 1

t + -1.8 = 1.897366596 Simplifying t + -1.8 = 1.897366596 Reorder the terms: -1.8 + t = 1.897366596 Solving -1.8 + t = 1.897366596 Solving for variable 't'. Move all terms containing t to the left, all other terms to the right. Add '1.8' to each side of the equation. -1.8 + 1.8 + t = 1.897366596 + 1.8 Combine like terms: -1.8 + 1.8 = 0.0 0.0 + t = 1.897366596 + 1.8 t = 1.897366596 + 1.8 Combine like terms: 1.897366596 + 1.8 = 3.697366596 t = 3.697366596 Simplifying t = 3.697366596

Subproblem 2

t + -1.8 = -1.897366596 Simplifying t + -1.8 = -1.897366596 Reorder the terms: -1.8 + t = -1.897366596 Solving -1.8 + t = -1.897366596 Solving for variable 't'. Move all terms containing t to the left, all other terms to the right. Add '1.8' to each side of the equation. -1.8 + 1.8 + t = -1.897366596 + 1.8 Combine like terms: -1.8 + 1.8 = 0.0 0.0 + t = -1.897366596 + 1.8 t = -1.897366596 + 1.8 Combine like terms: -1.897366596 + 1.8 = -0.097366596 t = -0.097366596 Simplifying t = -0.097366596

Solution

The solution to the problem is based on the solutions from the subproblems. t = {3.697366596, -0.097366596}

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