p^2-17p-39=0

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Solution for p^2-17p-39=0 equation:


Simplifying
p2 + -17p + -39 = 0

Reorder the terms:
-39 + -17p + p2 = 0

Solving
-39 + -17p + p2 = 0

Solving for variable 'p'.

Begin completing the square.

Move the constant term to the right:

Add '39' to each side of the equation.
-39 + -17p + 39 + p2 = 0 + 39

Reorder the terms:
-39 + 39 + -17p + p2 = 0 + 39

Combine like terms: -39 + 39 = 0
0 + -17p + p2 = 0 + 39
-17p + p2 = 0 + 39

Combine like terms: 0 + 39 = 39
-17p + p2 = 39

The p term is -17p.  Take half its coefficient (-8.5).
Square it (72.25) and add it to both sides.

Add '72.25' to each side of the equation.
-17p + 72.25 + p2 = 39 + 72.25

Reorder the terms:
72.25 + -17p + p2 = 39 + 72.25

Combine like terms: 39 + 72.25 = 111.25
72.25 + -17p + p2 = 111.25

Factor a perfect square on the left side:
(p + -8.5)(p + -8.5) = 111.25

Calculate the square root of the right side: 10.547511555

Break this problem into two subproblems by setting 
(p + -8.5) equal to 10.547511555 and -10.547511555.

Subproblem 1

p + -8.5 = 10.547511555 Simplifying p + -8.5 = 10.547511555 Reorder the terms: -8.5 + p = 10.547511555 Solving -8.5 + p = 10.547511555 Solving for variable 'p'. Move all terms containing p to the left, all other terms to the right. Add '8.5' to each side of the equation. -8.5 + 8.5 + p = 10.547511555 + 8.5 Combine like terms: -8.5 + 8.5 = 0.0 0.0 + p = 10.547511555 + 8.5 p = 10.547511555 + 8.5 Combine like terms: 10.547511555 + 8.5 = 19.047511555 p = 19.047511555 Simplifying p = 19.047511555

Subproblem 2

p + -8.5 = -10.547511555 Simplifying p + -8.5 = -10.547511555 Reorder the terms: -8.5 + p = -10.547511555 Solving -8.5 + p = -10.547511555 Solving for variable 'p'. Move all terms containing p to the left, all other terms to the right. Add '8.5' to each side of the equation. -8.5 + 8.5 + p = -10.547511555 + 8.5 Combine like terms: -8.5 + 8.5 = 0.0 0.0 + p = -10.547511555 + 8.5 p = -10.547511555 + 8.5 Combine like terms: -10.547511555 + 8.5 = -2.047511555 p = -2.047511555 Simplifying p = -2.047511555

Solution

The solution to the problem is based on the solutions from the subproblems. p = {19.047511555, -2.047511555}

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