5t^2-8t-8=0

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Solution for 5t^2-8t-8=0 equation:


Simplifying
5t2 + -8t + -8 = 0

Reorder the terms:
-8 + -8t + 5t2 = 0

Solving
-8 + -8t + 5t2 = 0

Solving for variable 't'.

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

Divide each side by '5'.
-1.6 + -1.6t + t2 = 0

Move the constant term to the right:

Add '1.6' to each side of the equation.
-1.6 + -1.6t + 1.6 + t2 = 0 + 1.6

Reorder the terms:
-1.6 + 1.6 + -1.6t + t2 = 0 + 1.6

Combine like terms: -1.6 + 1.6 = 0.0
0.0 + -1.6t + t2 = 0 + 1.6
-1.6t + t2 = 0 + 1.6

Combine like terms: 0 + 1.6 = 1.6
-1.6t + t2 = 1.6

The t term is -1.6t.  Take half its coefficient (-0.8).
Square it (0.64) and add it to both sides.

Add '0.64' to each side of the equation.
-1.6t + 0.64 + t2 = 1.6 + 0.64

Reorder the terms:
0.64 + -1.6t + t2 = 1.6 + 0.64

Combine like terms: 1.6 + 0.64 = 2.24
0.64 + -1.6t + t2 = 2.24

Factor a perfect square on the left side:
(t + -0.8)(t + -0.8) = 2.24

Calculate the square root of the right side: 1.496662955

Break this problem into two subproblems by setting 
(t + -0.8) equal to 1.496662955 and -1.496662955.

Subproblem 1

t + -0.8 = 1.496662955 Simplifying t + -0.8 = 1.496662955 Reorder the terms: -0.8 + t = 1.496662955 Solving -0.8 + t = 1.496662955 Solving for variable 't'. Move all terms containing t to the left, all other terms to the right. Add '0.8' to each side of the equation. -0.8 + 0.8 + t = 1.496662955 + 0.8 Combine like terms: -0.8 + 0.8 = 0.0 0.0 + t = 1.496662955 + 0.8 t = 1.496662955 + 0.8 Combine like terms: 1.496662955 + 0.8 = 2.296662955 t = 2.296662955 Simplifying t = 2.296662955

Subproblem 2

t + -0.8 = -1.496662955 Simplifying t + -0.8 = -1.496662955 Reorder the terms: -0.8 + t = -1.496662955 Solving -0.8 + t = -1.496662955 Solving for variable 't'. Move all terms containing t to the left, all other terms to the right. Add '0.8' to each side of the equation. -0.8 + 0.8 + t = -1.496662955 + 0.8 Combine like terms: -0.8 + 0.8 = 0.0 0.0 + t = -1.496662955 + 0.8 t = -1.496662955 + 0.8 Combine like terms: -1.496662955 + 0.8 = -0.696662955 t = -0.696662955 Simplifying t = -0.696662955

Solution

The solution to the problem is based on the solutions from the subproblems. t = {2.296662955, -0.696662955}

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