8p^2-21p-36=0

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Solution for 8p^2-21p-36=0 equation:


Simplifying
8p2 + -21p + -36 = 0

Reorder the terms:
-36 + -21p + 8p2 = 0

Solving
-36 + -21p + 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'.
-4.5 + -2.625p + p2 = 0

Move the constant term to the right:

Add '4.5' to each side of the equation.
-4.5 + -2.625p + 4.5 + p2 = 0 + 4.5

Reorder the terms:
-4.5 + 4.5 + -2.625p + p2 = 0 + 4.5

Combine like terms: -4.5 + 4.5 = 0.0
0.0 + -2.625p + p2 = 0 + 4.5
-2.625p + p2 = 0 + 4.5

Combine like terms: 0 + 4.5 = 4.5
-2.625p + p2 = 4.5

The p term is -2.625p.  Take half its coefficient (-1.3125).
Square it (1.72265625) and add it to both sides.

Add '1.72265625' to each side of the equation.
-2.625p + 1.72265625 + p2 = 4.5 + 1.72265625

Reorder the terms:
1.72265625 + -2.625p + p2 = 4.5 + 1.72265625

Combine like terms: 4.5 + 1.72265625 = 6.22265625
1.72265625 + -2.625p + p2 = 6.22265625

Factor a perfect square on the left side:
(p + -1.3125)(p + -1.3125) = 6.22265625

Calculate the square root of the right side: 2.494525255

Break this problem into two subproblems by setting 
(p + -1.3125) equal to 2.494525255 and -2.494525255.

Subproblem 1

p + -1.3125 = 2.494525255 Simplifying p + -1.3125 = 2.494525255 Reorder the terms: -1.3125 + p = 2.494525255 Solving -1.3125 + p = 2.494525255 Solving for variable 'p'. Move all terms containing p to the left, all other terms to the right. Add '1.3125' to each side of the equation. -1.3125 + 1.3125 + p = 2.494525255 + 1.3125 Combine like terms: -1.3125 + 1.3125 = 0.0000 0.0000 + p = 2.494525255 + 1.3125 p = 2.494525255 + 1.3125 Combine like terms: 2.494525255 + 1.3125 = 3.807025255 p = 3.807025255 Simplifying p = 3.807025255

Subproblem 2

p + -1.3125 = -2.494525255 Simplifying p + -1.3125 = -2.494525255 Reorder the terms: -1.3125 + p = -2.494525255 Solving -1.3125 + p = -2.494525255 Solving for variable 'p'. Move all terms containing p to the left, all other terms to the right. Add '1.3125' to each side of the equation. -1.3125 + 1.3125 + p = -2.494525255 + 1.3125 Combine like terms: -1.3125 + 1.3125 = 0.0000 0.0000 + p = -2.494525255 + 1.3125 p = -2.494525255 + 1.3125 Combine like terms: -2.494525255 + 1.3125 = -1.182025255 p = -1.182025255 Simplifying p = -1.182025255

Solution

The solution to the problem is based on the solutions from the subproblems. p = {3.807025255, -1.182025255}

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