2t^2-18t-5=0

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


Simplifying
2t2 + -18t + -5 = 0

Reorder the terms:
-5 + -18t + 2t2 = 0

Solving
-5 + -18t + 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 + -9t + t2 = 0

Move the constant term to the right:

Add '2.5' to each side of the equation.
-2.5 + -9t + 2.5 + t2 = 0 + 2.5

Reorder the terms:
-2.5 + 2.5 + -9t + t2 = 0 + 2.5

Combine like terms: -2.5 + 2.5 = 0.0
0.0 + -9t + t2 = 0 + 2.5
-9t + t2 = 0 + 2.5

Combine like terms: 0 + 2.5 = 2.5
-9t + t2 = 2.5

The t term is -9t.  Take half its coefficient (-4.5).
Square it (20.25) and add it to both sides.

Add '20.25' to each side of the equation.
-9t + 20.25 + t2 = 2.5 + 20.25

Reorder the terms:
20.25 + -9t + t2 = 2.5 + 20.25

Combine like terms: 2.5 + 20.25 = 22.75
20.25 + -9t + t2 = 22.75

Factor a perfect square on the left side:
(t + -4.5)(t + -4.5) = 22.75

Calculate the square root of the right side: 4.769696007

Break this problem into two subproblems by setting 
(t + -4.5) equal to 4.769696007 and -4.769696007.

Subproblem 1

t + -4.5 = 4.769696007 Simplifying t + -4.5 = 4.769696007 Reorder the terms: -4.5 + t = 4.769696007 Solving -4.5 + t = 4.769696007 Solving for variable 't'. Move all terms containing t to the left, all other terms to the right. Add '4.5' to each side of the equation. -4.5 + 4.5 + t = 4.769696007 + 4.5 Combine like terms: -4.5 + 4.5 = 0.0 0.0 + t = 4.769696007 + 4.5 t = 4.769696007 + 4.5 Combine like terms: 4.769696007 + 4.5 = 9.269696007 t = 9.269696007 Simplifying t = 9.269696007

Subproblem 2

t + -4.5 = -4.769696007 Simplifying t + -4.5 = -4.769696007 Reorder the terms: -4.5 + t = -4.769696007 Solving -4.5 + t = -4.769696007 Solving for variable 't'. Move all terms containing t to the left, all other terms to the right. Add '4.5' to each side of the equation. -4.5 + 4.5 + t = -4.769696007 + 4.5 Combine like terms: -4.5 + 4.5 = 0.0 0.0 + t = -4.769696007 + 4.5 t = -4.769696007 + 4.5 Combine like terms: -4.769696007 + 4.5 = -0.269696007 t = -0.269696007 Simplifying t = -0.269696007

Solution

The solution to the problem is based on the solutions from the subproblems. t = {9.269696007, -0.269696007}

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