5t^2-18t-3=0

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Solution for 5t^2-18t-3=0 equation:


Simplifying
5t2 + -18t + -3 = 0

Reorder the terms:
-3 + -18t + 5t2 = 0

Solving
-3 + -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'.
-0.6 + -3.6t + t2 = 0

Move the constant term to the right:

Add '0.6' to each side of the equation.
-0.6 + -3.6t + 0.6 + t2 = 0 + 0.6

Reorder the terms:
-0.6 + 0.6 + -3.6t + t2 = 0 + 0.6

Combine like terms: -0.6 + 0.6 = 0.0
0.0 + -3.6t + t2 = 0 + 0.6
-3.6t + t2 = 0 + 0.6

Combine like terms: 0 + 0.6 = 0.6
-3.6t + t2 = 0.6

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 = 0.6 + 3.24

Reorder the terms:
3.24 + -3.6t + t2 = 0.6 + 3.24

Combine like terms: 0.6 + 3.24 = 3.84
3.24 + -3.6t + t2 = 3.84

Factor a perfect square on the left side:
(t + -1.8)(t + -1.8) = 3.84

Calculate the square root of the right side: 1.959591794

Break this problem into two subproblems by setting 
(t + -1.8) equal to 1.959591794 and -1.959591794.

Subproblem 1

t + -1.8 = 1.959591794 Simplifying t + -1.8 = 1.959591794 Reorder the terms: -1.8 + t = 1.959591794 Solving -1.8 + t = 1.959591794 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 = 1.959591794 + 1.8 Combine like terms: -1.8 + 1.8 = 0.0 0.0 + t = 1.959591794 + 1.8 t = 1.959591794 + 1.8 Combine like terms: 1.959591794 + 1.8 = 3.759591794 t = 3.759591794 Simplifying t = 3.759591794

Subproblem 2

t + -1.8 = -1.959591794 Simplifying t + -1.8 = -1.959591794 Reorder the terms: -1.8 + t = -1.959591794 Solving -1.8 + t = -1.959591794 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 = -1.959591794 + 1.8 Combine like terms: -1.8 + 1.8 = 0.0 0.0 + t = -1.959591794 + 1.8 t = -1.959591794 + 1.8 Combine like terms: -1.959591794 + 1.8 = -0.159591794 t = -0.159591794 Simplifying t = -0.159591794

Solution

The solution to the problem is based on the solutions from the subproblems. t = {3.759591794, -0.159591794}

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