9.8t^2-14t-82=0

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Solution for 9.8t^2-14t-82=0 equation:


Simplifying
9.8t2 + -14t + -82 = 0

Reorder the terms:
-82 + -14t + 9.8t2 = 0

Solving
-82 + -14t + 9.8t2 = 0

Solving for variable 't'.

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

Divide each side by '9.8'.
-8.367346939 + -1.428571429t + t2 = 0

Move the constant term to the right:

Add '8.367346939' to each side of the equation.
-8.367346939 + -1.428571429t + 8.367346939 + t2 = 0 + 8.367346939

Reorder the terms:
-8.367346939 + 8.367346939 + -1.428571429t + t2 = 0 + 8.367346939

Combine like terms: -8.367346939 + 8.367346939 = 0.000000000
0.000000000 + -1.428571429t + t2 = 0 + 8.367346939
-1.428571429t + t2 = 0 + 8.367346939

Combine like terms: 0 + 8.367346939 = 8.367346939
-1.428571429t + t2 = 8.367346939

The t term is -1.428571429t.  Take half its coefficient (-0.7142857145).
Square it (0.5102040819) and add it to both sides.

Add '0.5102040819' to each side of the equation.
-1.428571429t + 0.5102040819 + t2 = 8.367346939 + 0.5102040819

Reorder the terms:
0.5102040819 + -1.428571429t + t2 = 8.367346939 + 0.5102040819

Combine like terms: 8.367346939 + 0.5102040819 = 8.8775510209
0.5102040819 + -1.428571429t + t2 = 8.8775510209

Factor a perfect square on the left side:
(t + -0.7142857145)(t + -0.7142857145) = 8.8775510209

Calculate the square root of the right side: 2.979521945

Break this problem into two subproblems by setting 
(t + -0.7142857145) equal to 2.979521945 and -2.979521945.

Subproblem 1

t + -0.7142857145 = 2.979521945 Simplifying t + -0.7142857145 = 2.979521945 Reorder the terms: -0.7142857145 + t = 2.979521945 Solving -0.7142857145 + t = 2.979521945 Solving for variable 't'. Move all terms containing t to the left, all other terms to the right. Add '0.7142857145' to each side of the equation. -0.7142857145 + 0.7142857145 + t = 2.979521945 + 0.7142857145 Combine like terms: -0.7142857145 + 0.7142857145 = 0.0000000000 0.0000000000 + t = 2.979521945 + 0.7142857145 t = 2.979521945 + 0.7142857145 Combine like terms: 2.979521945 + 0.7142857145 = 3.6938076595 t = 3.6938076595 Simplifying t = 3.6938076595

Subproblem 2

t + -0.7142857145 = -2.979521945 Simplifying t + -0.7142857145 = -2.979521945 Reorder the terms: -0.7142857145 + t = -2.979521945 Solving -0.7142857145 + t = -2.979521945 Solving for variable 't'. Move all terms containing t to the left, all other terms to the right. Add '0.7142857145' to each side of the equation. -0.7142857145 + 0.7142857145 + t = -2.979521945 + 0.7142857145 Combine like terms: -0.7142857145 + 0.7142857145 = 0.0000000000 0.0000000000 + t = -2.979521945 + 0.7142857145 t = -2.979521945 + 0.7142857145 Combine like terms: -2.979521945 + 0.7142857145 = -2.2652362305 t = -2.2652362305 Simplifying t = -2.2652362305

Solution

The solution to the problem is based on the solutions from the subproblems. t = {3.6938076595, -2.2652362305}

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