t^2+5t+6=666

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Solution for t^2+5t+6=666 equation:


Simplifying
t2 + 5t + 6 = 666

Reorder the terms:
6 + 5t + t2 = 666

Solving
6 + 5t + t2 = 666

Solving for variable 't'.

Reorder the terms:
6 + -666 + 5t + t2 = 666 + -666

Combine like terms: 6 + -666 = -660
-660 + 5t + t2 = 666 + -666

Combine like terms: 666 + -666 = 0
-660 + 5t + t2 = 0

Begin completing the square.

Move the constant term to the right:

Add '660' to each side of the equation.
-660 + 5t + 660 + t2 = 0 + 660

Reorder the terms:
-660 + 660 + 5t + t2 = 0 + 660

Combine like terms: -660 + 660 = 0
0 + 5t + t2 = 0 + 660
5t + t2 = 0 + 660

Combine like terms: 0 + 660 = 660
5t + t2 = 660

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 = 660 + 6.25

Reorder the terms:
6.25 + 5t + t2 = 660 + 6.25

Combine like terms: 660 + 6.25 = 666.25
6.25 + 5t + t2 = 666.25

Factor a perfect square on the left side:
(t + 2.5)(t + 2.5) = 666.25

Calculate the square root of the right side: 25.811818998

Break this problem into two subproblems by setting 
(t + 2.5) equal to 25.811818998 and -25.811818998.

Subproblem 1

t + 2.5 = 25.811818998 Simplifying t + 2.5 = 25.811818998 Reorder the terms: 2.5 + t = 25.811818998 Solving 2.5 + t = 25.811818998 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 = 25.811818998 + -2.5 Combine like terms: 2.5 + -2.5 = 0.0 0.0 + t = 25.811818998 + -2.5 t = 25.811818998 + -2.5 Combine like terms: 25.811818998 + -2.5 = 23.311818998 t = 23.311818998 Simplifying t = 23.311818998

Subproblem 2

t + 2.5 = -25.811818998 Simplifying t + 2.5 = -25.811818998 Reorder the terms: 2.5 + t = -25.811818998 Solving 2.5 + t = -25.811818998 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 = -25.811818998 + -2.5 Combine like terms: 2.5 + -2.5 = 0.0 0.0 + t = -25.811818998 + -2.5 t = -25.811818998 + -2.5 Combine like terms: -25.811818998 + -2.5 = -28.311818998 t = -28.311818998 Simplifying t = -28.311818998

Solution

The solution to the problem is based on the solutions from the subproblems. t = {23.311818998, -28.311818998}

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