2t^2-15t-6=0

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Solution for 2t^2-15t-6=0 equation:


Simplifying
2t2 + -15t + -6 = 0

Reorder the terms:
-6 + -15t + 2t2 = 0

Solving
-6 + -15t + 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'.
-3 + -7.5t + t2 = 0

Move the constant term to the right:

Add '3' to each side of the equation.
-3 + -7.5t + 3 + t2 = 0 + 3

Reorder the terms:
-3 + 3 + -7.5t + t2 = 0 + 3

Combine like terms: -3 + 3 = 0
0 + -7.5t + t2 = 0 + 3
-7.5t + t2 = 0 + 3

Combine like terms: 0 + 3 = 3
-7.5t + t2 = 3

The t term is -7.5t.  Take half its coefficient (-3.75).
Square it (14.0625) and add it to both sides.

Add '14.0625' to each side of the equation.
-7.5t + 14.0625 + t2 = 3 + 14.0625

Reorder the terms:
14.0625 + -7.5t + t2 = 3 + 14.0625

Combine like terms: 3 + 14.0625 = 17.0625
14.0625 + -7.5t + t2 = 17.0625

Factor a perfect square on the left side:
(t + -3.75)(t + -3.75) = 17.0625

Calculate the square root of the right side: 4.13067791

Break this problem into two subproblems by setting 
(t + -3.75) equal to 4.13067791 and -4.13067791.

Subproblem 1

t + -3.75 = 4.13067791 Simplifying t + -3.75 = 4.13067791 Reorder the terms: -3.75 + t = 4.13067791 Solving -3.75 + t = 4.13067791 Solving for variable 't'. Move all terms containing t to the left, all other terms to the right. Add '3.75' to each side of the equation. -3.75 + 3.75 + t = 4.13067791 + 3.75 Combine like terms: -3.75 + 3.75 = 0.00 0.00 + t = 4.13067791 + 3.75 t = 4.13067791 + 3.75 Combine like terms: 4.13067791 + 3.75 = 7.88067791 t = 7.88067791 Simplifying t = 7.88067791

Subproblem 2

t + -3.75 = -4.13067791 Simplifying t + -3.75 = -4.13067791 Reorder the terms: -3.75 + t = -4.13067791 Solving -3.75 + t = -4.13067791 Solving for variable 't'. Move all terms containing t to the left, all other terms to the right. Add '3.75' to each side of the equation. -3.75 + 3.75 + t = -4.13067791 + 3.75 Combine like terms: -3.75 + 3.75 = 0.00 0.00 + t = -4.13067791 + 3.75 t = -4.13067791 + 3.75 Combine like terms: -4.13067791 + 3.75 = -0.38067791 t = -0.38067791 Simplifying t = -0.38067791

Solution

The solution to the problem is based on the solutions from the subproblems. t = {7.88067791, -0.38067791}

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