t^2-5t-12=0

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Solution for t^2-5t-12=0 equation:


Simplifying
t2 + -5t + -12 = 0

Reorder the terms:
-12 + -5t + t2 = 0

Solving
-12 + -5t + t2 = 0

Solving for variable 't'.

Begin completing the square.

Move the constant term to the right:

Add '12' to each side of the equation.
-12 + -5t + 12 + t2 = 0 + 12

Reorder the terms:
-12 + 12 + -5t + t2 = 0 + 12

Combine like terms: -12 + 12 = 0
0 + -5t + t2 = 0 + 12
-5t + t2 = 0 + 12

Combine like terms: 0 + 12 = 12
-5t + t2 = 12

The t term is -5t.  Take half its coefficient (-2.5).
Square it (6.25) and add it to both sides.

Add '6.25' to each side of the equation.
-5t + 6.25 + t2 = 12 + 6.25

Reorder the terms:
6.25 + -5t + t2 = 12 + 6.25

Combine like terms: 12 + 6.25 = 18.25
6.25 + -5t + t2 = 18.25

Factor a perfect square on the left side:
(t + -2.5)(t + -2.5) = 18.25

Calculate the square root of the right side: 4.272001873

Break this problem into two subproblems by setting 
(t + -2.5) equal to 4.272001873 and -4.272001873.

Subproblem 1

t + -2.5 = 4.272001873 Simplifying t + -2.5 = 4.272001873 Reorder the terms: -2.5 + t = 4.272001873 Solving -2.5 + t = 4.272001873 Solving for variable 't'. Move all terms containing t to the left, all other terms to the right. Add '2.5' to each side of the equation. -2.5 + 2.5 + t = 4.272001873 + 2.5 Combine like terms: -2.5 + 2.5 = 0.0 0.0 + t = 4.272001873 + 2.5 t = 4.272001873 + 2.5 Combine like terms: 4.272001873 + 2.5 = 6.772001873 t = 6.772001873 Simplifying t = 6.772001873

Subproblem 2

t + -2.5 = -4.272001873 Simplifying t + -2.5 = -4.272001873 Reorder the terms: -2.5 + t = -4.272001873 Solving -2.5 + t = -4.272001873 Solving for variable 't'. Move all terms containing t to the left, all other terms to the right. Add '2.5' to each side of the equation. -2.5 + 2.5 + t = -4.272001873 + 2.5 Combine like terms: -2.5 + 2.5 = 0.0 0.0 + t = -4.272001873 + 2.5 t = -4.272001873 + 2.5 Combine like terms: -4.272001873 + 2.5 = -1.772001873 t = -1.772001873 Simplifying t = -1.772001873

Solution

The solution to the problem is based on the solutions from the subproblems. t = {6.772001873, -1.772001873}

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