8t^2-t-28=0

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Solution for 8t^2-t-28=0 equation:


Simplifying
8t2 + -1t + -28 = 0

Reorder the terms:
-28 + -1t + 8t2 = 0

Solving
-28 + -1t + 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'.
-3.5 + -0.125t + t2 = 0

Move the constant term to the right:

Add '3.5' to each side of the equation.
-3.5 + -0.125t + 3.5 + t2 = 0 + 3.5

Reorder the terms:
-3.5 + 3.5 + -0.125t + t2 = 0 + 3.5

Combine like terms: -3.5 + 3.5 = 0.0
0.0 + -0.125t + t2 = 0 + 3.5
-0.125t + t2 = 0 + 3.5

Combine like terms: 0 + 3.5 = 3.5
-0.125t + t2 = 3.5

The t term is -0.125t.  Take half its coefficient (-0.0625).
Square it (0.00390625) and add it to both sides.

Add '0.00390625' to each side of the equation.
-0.125t + 0.00390625 + t2 = 3.5 + 0.00390625

Reorder the terms:
0.00390625 + -0.125t + t2 = 3.5 + 0.00390625

Combine like terms: 3.5 + 0.00390625 = 3.50390625
0.00390625 + -0.125t + t2 = 3.50390625

Factor a perfect square on the left side:
(t + -0.0625)(t + -0.0625) = 3.50390625

Calculate the square root of the right side: 1.871872391

Break this problem into two subproblems by setting 
(t + -0.0625) equal to 1.871872391 and -1.871872391.

Subproblem 1

t + -0.0625 = 1.871872391 Simplifying t + -0.0625 = 1.871872391 Reorder the terms: -0.0625 + t = 1.871872391 Solving -0.0625 + t = 1.871872391 Solving for variable 't'. Move all terms containing t to the left, all other terms to the right. Add '0.0625' to each side of the equation. -0.0625 + 0.0625 + t = 1.871872391 + 0.0625 Combine like terms: -0.0625 + 0.0625 = 0.0000 0.0000 + t = 1.871872391 + 0.0625 t = 1.871872391 + 0.0625 Combine like terms: 1.871872391 + 0.0625 = 1.934372391 t = 1.934372391 Simplifying t = 1.934372391

Subproblem 2

t + -0.0625 = -1.871872391 Simplifying t + -0.0625 = -1.871872391 Reorder the terms: -0.0625 + t = -1.871872391 Solving -0.0625 + t = -1.871872391 Solving for variable 't'. Move all terms containing t to the left, all other terms to the right. Add '0.0625' to each side of the equation. -0.0625 + 0.0625 + t = -1.871872391 + 0.0625 Combine like terms: -0.0625 + 0.0625 = 0.0000 0.0000 + t = -1.871872391 + 0.0625 t = -1.871872391 + 0.0625 Combine like terms: -1.871872391 + 0.0625 = -1.809372391 t = -1.809372391 Simplifying t = -1.809372391

Solution

The solution to the problem is based on the solutions from the subproblems. t = {1.934372391, -1.809372391}

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