8p^2-16p-5=0

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Solution for 8p^2-16p-5=0 equation:


Simplifying
8p2 + -16p + -5 = 0

Reorder the terms:
-5 + -16p + 8p2 = 0

Solving
-5 + -16p + 8p2 = 0

Solving for variable 'p'.

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

Divide each side by '8'.
-0.625 + -2p + p2 = 0

Move the constant term to the right:

Add '0.625' to each side of the equation.
-0.625 + -2p + 0.625 + p2 = 0 + 0.625

Reorder the terms:
-0.625 + 0.625 + -2p + p2 = 0 + 0.625

Combine like terms: -0.625 + 0.625 = 0.000
0.000 + -2p + p2 = 0 + 0.625
-2p + p2 = 0 + 0.625

Combine like terms: 0 + 0.625 = 0.625
-2p + p2 = 0.625

The p term is -2p.  Take half its coefficient (-1).
Square it (1) and add it to both sides.

Add '1' to each side of the equation.
-2p + 1 + p2 = 0.625 + 1

Reorder the terms:
1 + -2p + p2 = 0.625 + 1

Combine like terms: 0.625 + 1 = 1.625
1 + -2p + p2 = 1.625

Factor a perfect square on the left side:
(p + -1)(p + -1) = 1.625

Calculate the square root of the right side: 1.274754878

Break this problem into two subproblems by setting 
(p + -1) equal to 1.274754878 and -1.274754878.

Subproblem 1

p + -1 = 1.274754878 Simplifying p + -1 = 1.274754878 Reorder the terms: -1 + p = 1.274754878 Solving -1 + p = 1.274754878 Solving for variable 'p'. Move all terms containing p to the left, all other terms to the right. Add '1' to each side of the equation. -1 + 1 + p = 1.274754878 + 1 Combine like terms: -1 + 1 = 0 0 + p = 1.274754878 + 1 p = 1.274754878 + 1 Combine like terms: 1.274754878 + 1 = 2.274754878 p = 2.274754878 Simplifying p = 2.274754878

Subproblem 2

p + -1 = -1.274754878 Simplifying p + -1 = -1.274754878 Reorder the terms: -1 + p = -1.274754878 Solving -1 + p = -1.274754878 Solving for variable 'p'. Move all terms containing p to the left, all other terms to the right. Add '1' to each side of the equation. -1 + 1 + p = -1.274754878 + 1 Combine like terms: -1 + 1 = 0 0 + p = -1.274754878 + 1 p = -1.274754878 + 1 Combine like terms: -1.274754878 + 1 = -0.274754878 p = -0.274754878 Simplifying p = -0.274754878

Solution

The solution to the problem is based on the solutions from the subproblems. p = {2.274754878, -0.274754878}

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