0=67-5t-5t^2

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Solution for 0=67-5t-5t^2 equation:


Simplifying
0 = 67 + -5t + -5t2

Solving
0 = 67 + -5t + -5t2

Solving for variable 't'.

Combine like terms: 0 + -67 = -67
-67 + 5t + 5t2 = 67 + -5t + -5t2 + -67 + 5t + 5t2

Reorder the terms:
-67 + 5t + 5t2 = 67 + -67 + -5t + 5t + -5t2 + 5t2

Combine like terms: 67 + -67 = 0
-67 + 5t + 5t2 = 0 + -5t + 5t + -5t2 + 5t2
-67 + 5t + 5t2 = -5t + 5t + -5t2 + 5t2

Combine like terms: -5t + 5t = 0
-67 + 5t + 5t2 = 0 + -5t2 + 5t2
-67 + 5t + 5t2 = -5t2 + 5t2

Combine like terms: -5t2 + 5t2 = 0
-67 + 5t + 5t2 = 0

Begin completing the square.  Divide all terms by
5 the coefficient of the squared term: 

Divide each side by '5'.
-13.4 + t + t2 = 0

Move the constant term to the right:

Add '13.4' to each side of the equation.
-13.4 + t + 13.4 + t2 = 0 + 13.4

Reorder the terms:
-13.4 + 13.4 + t + t2 = 0 + 13.4

Combine like terms: -13.4 + 13.4 = 0.0
0.0 + t + t2 = 0 + 13.4
t + t2 = 0 + 13.4

Combine like terms: 0 + 13.4 = 13.4
t + t2 = 13.4

The t term is t.  Take half its coefficient (0.5).
Square it (0.25) and add it to both sides.

Add '0.25' to each side of the equation.
 + 0.25 + t2 = 13.4 + 0.25

Combine like terms:  + 0.25 = 1.25
1.25 + t2 = 13.4 + 0.25

Combine like terms: 13.4 + 0.25 = 13.65
1.25 + t2 = 13.65

Factor a perfect square on the left side:
(t + 0.5)(t + 0.5) = 13.65

Calculate the square root of the right side: 3.69459064

Break this problem into two subproblems by setting 
(t + 0.5) equal to 3.69459064 and -3.69459064.

Subproblem 1

t + 0.5 = 3.69459064 Simplifying t + 0.5 = 3.69459064 Reorder the terms: 0.5 + t = 3.69459064 Solving 0.5 + t = 3.69459064 Solving for variable 't'. Move all terms containing t to the left, all other terms to the right. Add '-0.5' to each side of the equation. 0.5 + -0.5 + t = 3.69459064 + -0.5 Combine like terms: 0.5 + -0.5 = 0.0 0.0 + t = 3.69459064 + -0.5 t = 3.69459064 + -0.5 Combine like terms: 3.69459064 + -0.5 = 3.19459064 t = 3.19459064 Simplifying t = 3.19459064

Subproblem 2

t + 0.5 = -3.69459064 Simplifying t + 0.5 = -3.69459064 Reorder the terms: 0.5 + t = -3.69459064 Solving 0.5 + t = -3.69459064 Solving for variable 't'. Move all terms containing t to the left, all other terms to the right. Add '-0.5' to each side of the equation. 0.5 + -0.5 + t = -3.69459064 + -0.5 Combine like terms: 0.5 + -0.5 = 0.0 0.0 + t = -3.69459064 + -0.5 t = -3.69459064 + -0.5 Combine like terms: -3.69459064 + -0.5 = -4.19459064 t = -4.19459064 Simplifying t = -4.19459064

Solution

The solution to the problem is based on the solutions from the subproblems. t = {3.19459064, -4.19459064}

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