2t^2+13t-18=0

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Solution for 2t^2+13t-18=0 equation:


Simplifying
2t2 + 13t + -18 = 0

Reorder the terms:
-18 + 13t + 2t2 = 0

Solving
-18 + 13t + 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'.
-9 + 6.5t + t2 = 0

Move the constant term to the right:

Add '9' to each side of the equation.
-9 + 6.5t + 9 + t2 = 0 + 9

Reorder the terms:
-9 + 9 + 6.5t + t2 = 0 + 9

Combine like terms: -9 + 9 = 0
0 + 6.5t + t2 = 0 + 9
6.5t + t2 = 0 + 9

Combine like terms: 0 + 9 = 9
6.5t + t2 = 9

The t term is 6.5t.  Take half its coefficient (3.25).
Square it (10.5625) and add it to both sides.

Add '10.5625' to each side of the equation.
6.5t + 10.5625 + t2 = 9 + 10.5625

Reorder the terms:
10.5625 + 6.5t + t2 = 9 + 10.5625

Combine like terms: 9 + 10.5625 = 19.5625
10.5625 + 6.5t + t2 = 19.5625

Factor a perfect square on the left side:
(t + 3.25)(t + 3.25) = 19.5625

Calculate the square root of the right side: 4.422951503

Break this problem into two subproblems by setting 
(t + 3.25) equal to 4.422951503 and -4.422951503.

Subproblem 1

t + 3.25 = 4.422951503 Simplifying t + 3.25 = 4.422951503 Reorder the terms: 3.25 + t = 4.422951503 Solving 3.25 + t = 4.422951503 Solving for variable 't'. Move all terms containing t to the left, all other terms to the right. Add '-3.25' to each side of the equation. 3.25 + -3.25 + t = 4.422951503 + -3.25 Combine like terms: 3.25 + -3.25 = 0.00 0.00 + t = 4.422951503 + -3.25 t = 4.422951503 + -3.25 Combine like terms: 4.422951503 + -3.25 = 1.172951503 t = 1.172951503 Simplifying t = 1.172951503

Subproblem 2

t + 3.25 = -4.422951503 Simplifying t + 3.25 = -4.422951503 Reorder the terms: 3.25 + t = -4.422951503 Solving 3.25 + t = -4.422951503 Solving for variable 't'. Move all terms containing t to the left, all other terms to the right. Add '-3.25' to each side of the equation. 3.25 + -3.25 + t = -4.422951503 + -3.25 Combine like terms: 3.25 + -3.25 = 0.00 0.00 + t = -4.422951503 + -3.25 t = -4.422951503 + -3.25 Combine like terms: -4.422951503 + -3.25 = -7.672951503 t = -7.672951503 Simplifying t = -7.672951503

Solution

The solution to the problem is based on the solutions from the subproblems. t = {1.172951503, -7.672951503}

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