3t^2-120t+800=0

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Solution for 3t^2-120t+800=0 equation:


Simplifying
3t2 + -120t + 800 = 0

Reorder the terms:
800 + -120t + 3t2 = 0

Solving
800 + -120t + 3t2 = 0

Solving for variable 't'.

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

Divide each side by '3'.
266.6666667 + -40t + t2 = 0

Move the constant term to the right:

Add '-266.6666667' to each side of the equation.
266.6666667 + -40t + -266.6666667 + t2 = 0 + -266.6666667

Reorder the terms:
266.6666667 + -266.6666667 + -40t + t2 = 0 + -266.6666667

Combine like terms: 266.6666667 + -266.6666667 = 0.0000000
0.0000000 + -40t + t2 = 0 + -266.6666667
-40t + t2 = 0 + -266.6666667

Combine like terms: 0 + -266.6666667 = -266.6666667
-40t + t2 = -266.6666667

The t term is -40t.  Take half its coefficient (-20).
Square it (400) and add it to both sides.

Add '400' to each side of the equation.
-40t + 400 + t2 = -266.6666667 + 400

Reorder the terms:
400 + -40t + t2 = -266.6666667 + 400

Combine like terms: -266.6666667 + 400 = 133.3333333
400 + -40t + t2 = 133.3333333

Factor a perfect square on the left side:
(t + -20)(t + -20) = 133.3333333

Calculate the square root of the right side: 11.547005382

Break this problem into two subproblems by setting 
(t + -20) equal to 11.547005382 and -11.547005382.

Subproblem 1

t + -20 = 11.547005382 Simplifying t + -20 = 11.547005382 Reorder the terms: -20 + t = 11.547005382 Solving -20 + t = 11.547005382 Solving for variable 't'. Move all terms containing t to the left, all other terms to the right. Add '20' to each side of the equation. -20 + 20 + t = 11.547005382 + 20 Combine like terms: -20 + 20 = 0 0 + t = 11.547005382 + 20 t = 11.547005382 + 20 Combine like terms: 11.547005382 + 20 = 31.547005382 t = 31.547005382 Simplifying t = 31.547005382

Subproblem 2

t + -20 = -11.547005382 Simplifying t + -20 = -11.547005382 Reorder the terms: -20 + t = -11.547005382 Solving -20 + t = -11.547005382 Solving for variable 't'. Move all terms containing t to the left, all other terms to the right. Add '20' to each side of the equation. -20 + 20 + t = -11.547005382 + 20 Combine like terms: -20 + 20 = 0 0 + t = -11.547005382 + 20 t = -11.547005382 + 20 Combine like terms: -11.547005382 + 20 = 8.452994618 t = 8.452994618 Simplifying t = 8.452994618

Solution

The solution to the problem is based on the solutions from the subproblems. t = {31.547005382, 8.452994618}

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