0=8t^2-7t-2

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Solution for 0=8t^2-7t-2 equation:


Simplifying
0 = 8t2 + -7t + -2

Reorder the terms:
0 = -2 + -7t + 8t2

Solving
0 = -2 + -7t + 8t2

Solving for variable 't'.

Combine like terms: 0 + 2 = 2
2 + 7t + -8t2 = -2 + -7t + 8t2 + 2 + 7t + -8t2

Reorder the terms:
2 + 7t + -8t2 = -2 + 2 + -7t + 7t + 8t2 + -8t2

Combine like terms: -2 + 2 = 0
2 + 7t + -8t2 = 0 + -7t + 7t + 8t2 + -8t2
2 + 7t + -8t2 = -7t + 7t + 8t2 + -8t2

Combine like terms: -7t + 7t = 0
2 + 7t + -8t2 = 0 + 8t2 + -8t2
2 + 7t + -8t2 = 8t2 + -8t2

Combine like terms: 8t2 + -8t2 = 0
2 + 7t + -8t2 = 0

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

Divide each side by '-8'.
-0.25 + -0.875t + t2 = 0

Move the constant term to the right:

Add '0.25' to each side of the equation.
-0.25 + -0.875t + 0.25 + t2 = 0 + 0.25

Reorder the terms:
-0.25 + 0.25 + -0.875t + t2 = 0 + 0.25

Combine like terms: -0.25 + 0.25 = 0.00
0.00 + -0.875t + t2 = 0 + 0.25
-0.875t + t2 = 0 + 0.25

Combine like terms: 0 + 0.25 = 0.25
-0.875t + t2 = 0.25

The t term is -0.875t.  Take half its coefficient (-0.4375).
Square it (0.19140625) and add it to both sides.

Add '0.19140625' to each side of the equation.
-0.875t + 0.19140625 + t2 = 0.25 + 0.19140625

Reorder the terms:
0.19140625 + -0.875t + t2 = 0.25 + 0.19140625

Combine like terms: 0.25 + 0.19140625 = 0.44140625
0.19140625 + -0.875t + t2 = 0.44140625

Factor a perfect square on the left side:
(t + -0.4375)(t + -0.4375) = 0.44140625

Calculate the square root of the right side: 0.664384113

Break this problem into two subproblems by setting 
(t + -0.4375) equal to 0.664384113 and -0.664384113.

Subproblem 1

t + -0.4375 = 0.664384113 Simplifying t + -0.4375 = 0.664384113 Reorder the terms: -0.4375 + t = 0.664384113 Solving -0.4375 + t = 0.664384113 Solving for variable 't'. Move all terms containing t to the left, all other terms to the right. Add '0.4375' to each side of the equation. -0.4375 + 0.4375 + t = 0.664384113 + 0.4375 Combine like terms: -0.4375 + 0.4375 = 0.0000 0.0000 + t = 0.664384113 + 0.4375 t = 0.664384113 + 0.4375 Combine like terms: 0.664384113 + 0.4375 = 1.101884113 t = 1.101884113 Simplifying t = 1.101884113

Subproblem 2

t + -0.4375 = -0.664384113 Simplifying t + -0.4375 = -0.664384113 Reorder the terms: -0.4375 + t = -0.664384113 Solving -0.4375 + t = -0.664384113 Solving for variable 't'. Move all terms containing t to the left, all other terms to the right. Add '0.4375' to each side of the equation. -0.4375 + 0.4375 + t = -0.664384113 + 0.4375 Combine like terms: -0.4375 + 0.4375 = 0.0000 0.0000 + t = -0.664384113 + 0.4375 t = -0.664384113 + 0.4375 Combine like terms: -0.664384113 + 0.4375 = -0.226884113 t = -0.226884113 Simplifying t = -0.226884113

Solution

The solution to the problem is based on the solutions from the subproblems. t = {1.101884113, -0.226884113}

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