8t^2-11t-4=0

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Solution for 8t^2-11t-4=0 equation:


Simplifying
8t2 + -11t + -4 = 0

Reorder the terms:
-4 + -11t + 8t2 = 0

Solving
-4 + -11t + 8t2 = 0

Solving for variable 't'.

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

Divide each side by '8'.
-0.5 + -1.375t + t2 = 0

Move the constant term to the right:

Add '0.5' to each side of the equation.
-0.5 + -1.375t + 0.5 + t2 = 0 + 0.5

Reorder the terms:
-0.5 + 0.5 + -1.375t + t2 = 0 + 0.5

Combine like terms: -0.5 + 0.5 = 0.0
0.0 + -1.375t + t2 = 0 + 0.5
-1.375t + t2 = 0 + 0.5

Combine like terms: 0 + 0.5 = 0.5
-1.375t + t2 = 0.5

The t term is -1.375t.  Take half its coefficient (-0.6875).
Square it (0.47265625) and add it to both sides.

Add '0.47265625' to each side of the equation.
-1.375t + 0.47265625 + t2 = 0.5 + 0.47265625

Reorder the terms:
0.47265625 + -1.375t + t2 = 0.5 + 0.47265625

Combine like terms: 0.5 + 0.47265625 = 0.97265625
0.47265625 + -1.375t + t2 = 0.97265625

Factor a perfect square on the left side:
(t + -0.6875)(t + -0.6875) = 0.97265625

Calculate the square root of the right side: 0.986233365

Break this problem into two subproblems by setting 
(t + -0.6875) equal to 0.986233365 and -0.986233365.

Subproblem 1

t + -0.6875 = 0.986233365 Simplifying t + -0.6875 = 0.986233365 Reorder the terms: -0.6875 + t = 0.986233365 Solving -0.6875 + t = 0.986233365 Solving for variable 't'. Move all terms containing t to the left, all other terms to the right. Add '0.6875' to each side of the equation. -0.6875 + 0.6875 + t = 0.986233365 + 0.6875 Combine like terms: -0.6875 + 0.6875 = 0.0000 0.0000 + t = 0.986233365 + 0.6875 t = 0.986233365 + 0.6875 Combine like terms: 0.986233365 + 0.6875 = 1.673733365 t = 1.673733365 Simplifying t = 1.673733365

Subproblem 2

t + -0.6875 = -0.986233365 Simplifying t + -0.6875 = -0.986233365 Reorder the terms: -0.6875 + t = -0.986233365 Solving -0.6875 + t = -0.986233365 Solving for variable 't'. Move all terms containing t to the left, all other terms to the right. Add '0.6875' to each side of the equation. -0.6875 + 0.6875 + t = -0.986233365 + 0.6875 Combine like terms: -0.6875 + 0.6875 = 0.0000 0.0000 + t = -0.986233365 + 0.6875 t = -0.986233365 + 0.6875 Combine like terms: -0.986233365 + 0.6875 = -0.298733365 t = -0.298733365 Simplifying t = -0.298733365

Solution

The solution to the problem is based on the solutions from the subproblems. t = {1.673733365, -0.298733365}

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