-0.8t^2+6t-8=0

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Solution for -0.8t^2+6t-8=0 equation:


Simplifying
-0.8t2 + 6t + -8 = 0

Reorder the terms:
-8 + 6t + -0.8t2 = 0

Solving
-8 + 6t + -0.8t2 = 0

Solving for variable 't'.

Begin completing the square.  Divide all terms by
-0.8 the coefficient of the squared term: 

Divide each side by '-0.8'.
10 + -7.5t + t2 = 0

Move the constant term to the right:

Add '-10' to each side of the equation.
10 + -7.5t + -10 + t2 = 0 + -10

Reorder the terms:
10 + -10 + -7.5t + t2 = 0 + -10

Combine like terms: 10 + -10 = 0
0 + -7.5t + t2 = 0 + -10
-7.5t + t2 = 0 + -10

Combine like terms: 0 + -10 = -10
-7.5t + t2 = -10

The t term is -7.5t.  Take half its coefficient (-3.75).
Square it (14.0625) and add it to both sides.

Add '14.0625' to each side of the equation.
-7.5t + 14.0625 + t2 = -10 + 14.0625

Reorder the terms:
14.0625 + -7.5t + t2 = -10 + 14.0625

Combine like terms: -10 + 14.0625 = 4.0625
14.0625 + -7.5t + t2 = 4.0625

Factor a perfect square on the left side:
(t + -3.75)(t + -3.75) = 4.0625

Calculate the square root of the right side: 2.015564437

Break this problem into two subproblems by setting 
(t + -3.75) equal to 2.015564437 and -2.015564437.

Subproblem 1

t + -3.75 = 2.015564437 Simplifying t + -3.75 = 2.015564437 Reorder the terms: -3.75 + t = 2.015564437 Solving -3.75 + t = 2.015564437 Solving for variable 't'. Move all terms containing t to the left, all other terms to the right. Add '3.75' to each side of the equation. -3.75 + 3.75 + t = 2.015564437 + 3.75 Combine like terms: -3.75 + 3.75 = 0.00 0.00 + t = 2.015564437 + 3.75 t = 2.015564437 + 3.75 Combine like terms: 2.015564437 + 3.75 = 5.765564437 t = 5.765564437 Simplifying t = 5.765564437

Subproblem 2

t + -3.75 = -2.015564437 Simplifying t + -3.75 = -2.015564437 Reorder the terms: -3.75 + t = -2.015564437 Solving -3.75 + t = -2.015564437 Solving for variable 't'. Move all terms containing t to the left, all other terms to the right. Add '3.75' to each side of the equation. -3.75 + 3.75 + t = -2.015564437 + 3.75 Combine like terms: -3.75 + 3.75 = 0.00 0.00 + t = -2.015564437 + 3.75 t = -2.015564437 + 3.75 Combine like terms: -2.015564437 + 3.75 = 1.734435563 t = 1.734435563 Simplifying t = 1.734435563

Solution

The solution to the problem is based on the solutions from the subproblems. t = {5.765564437, 1.734435563}

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