0=-7t^2-76t-11

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Solution for 0=-7t^2-76t-11 equation:


Simplifying
0 = -7t2 + -76t + -11

Reorder the terms:
0 = -11 + -76t + -7t2

Solving
0 = -11 + -76t + -7t2

Solving for variable 't'.

Combine like terms: 0 + 11 = 11
11 + 76t + 7t2 = -11 + -76t + -7t2 + 11 + 76t + 7t2

Reorder the terms:
11 + 76t + 7t2 = -11 + 11 + -76t + 76t + -7t2 + 7t2

Combine like terms: -11 + 11 = 0
11 + 76t + 7t2 = 0 + -76t + 76t + -7t2 + 7t2
11 + 76t + 7t2 = -76t + 76t + -7t2 + 7t2

Combine like terms: -76t + 76t = 0
11 + 76t + 7t2 = 0 + -7t2 + 7t2
11 + 76t + 7t2 = -7t2 + 7t2

Combine like terms: -7t2 + 7t2 = 0
11 + 76t + 7t2 = 0

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

Divide each side by '7'.
1.571428571 + 10.85714286t + t2 = 0

Move the constant term to the right:

Add '-1.571428571' to each side of the equation.
1.571428571 + 10.85714286t + -1.571428571 + t2 = 0 + -1.571428571

Reorder the terms:
1.571428571 + -1.571428571 + 10.85714286t + t2 = 0 + -1.571428571

Combine like terms: 1.571428571 + -1.571428571 = 0.000000000
0.000000000 + 10.85714286t + t2 = 0 + -1.571428571
10.85714286t + t2 = 0 + -1.571428571

Combine like terms: 0 + -1.571428571 = -1.571428571
10.85714286t + t2 = -1.571428571

The t term is 10.85714286t.  Take half its coefficient (5.42857143).
Square it (29.46938777) and add it to both sides.

Add '29.46938777' to each side of the equation.
10.85714286t + 29.46938777 + t2 = -1.571428571 + 29.46938777

Reorder the terms:
29.46938777 + 10.85714286t + t2 = -1.571428571 + 29.46938777

Combine like terms: -1.571428571 + 29.46938777 = 27.897959199
29.46938777 + 10.85714286t + t2 = 27.897959199

Factor a perfect square on the left side:
(t + 5.42857143)(t + 5.42857143) = 27.897959199

Calculate the square root of the right side: 5.281851872

Break this problem into two subproblems by setting 
(t + 5.42857143) equal to 5.281851872 and -5.281851872.

Subproblem 1

t + 5.42857143 = 5.281851872 Simplifying t + 5.42857143 = 5.281851872 Reorder the terms: 5.42857143 + t = 5.281851872 Solving 5.42857143 + t = 5.281851872 Solving for variable 't'. Move all terms containing t to the left, all other terms to the right. Add '-5.42857143' to each side of the equation. 5.42857143 + -5.42857143 + t = 5.281851872 + -5.42857143 Combine like terms: 5.42857143 + -5.42857143 = 0.00000000 0.00000000 + t = 5.281851872 + -5.42857143 t = 5.281851872 + -5.42857143 Combine like terms: 5.281851872 + -5.42857143 = -0.146719558 t = -0.146719558 Simplifying t = -0.146719558

Subproblem 2

t + 5.42857143 = -5.281851872 Simplifying t + 5.42857143 = -5.281851872 Reorder the terms: 5.42857143 + t = -5.281851872 Solving 5.42857143 + t = -5.281851872 Solving for variable 't'. Move all terms containing t to the left, all other terms to the right. Add '-5.42857143' to each side of the equation. 5.42857143 + -5.42857143 + t = -5.281851872 + -5.42857143 Combine like terms: 5.42857143 + -5.42857143 = 0.00000000 0.00000000 + t = -5.281851872 + -5.42857143 t = -5.281851872 + -5.42857143 Combine like terms: -5.281851872 + -5.42857143 = -10.710423302 t = -10.710423302 Simplifying t = -10.710423302

Solution

The solution to the problem is based on the solutions from the subproblems. t = {-0.146719558, -10.710423302}

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