p^2+18p=-11

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Solution for p^2+18p=-11 equation:


Simplifying
p2 + 18p = -11

Reorder the terms:
18p + p2 = -11

Solving
18p + p2 = -11

Solving for variable 'p'.

Reorder the terms:
11 + 18p + p2 = -11 + 11

Combine like terms: -11 + 11 = 0
11 + 18p + p2 = 0

Begin completing the square.

Move the constant term to the right:

Add '-11' to each side of the equation.
11 + 18p + -11 + p2 = 0 + -11

Reorder the terms:
11 + -11 + 18p + p2 = 0 + -11

Combine like terms: 11 + -11 = 0
0 + 18p + p2 = 0 + -11
18p + p2 = 0 + -11

Combine like terms: 0 + -11 = -11
18p + p2 = -11

The p term is 18p.  Take half its coefficient (9).
Square it (81) and add it to both sides.

Add '81' to each side of the equation.
18p + 81 + p2 = -11 + 81

Reorder the terms:
81 + 18p + p2 = -11 + 81

Combine like terms: -11 + 81 = 70
81 + 18p + p2 = 70

Factor a perfect square on the left side:
(p + 9)(p + 9) = 70

Calculate the square root of the right side: 8.366600265

Break this problem into two subproblems by setting 
(p + 9) equal to 8.366600265 and -8.366600265.

Subproblem 1

p + 9 = 8.366600265 Simplifying p + 9 = 8.366600265 Reorder the terms: 9 + p = 8.366600265 Solving 9 + p = 8.366600265 Solving for variable 'p'. Move all terms containing p to the left, all other terms to the right. Add '-9' to each side of the equation. 9 + -9 + p = 8.366600265 + -9 Combine like terms: 9 + -9 = 0 0 + p = 8.366600265 + -9 p = 8.366600265 + -9 Combine like terms: 8.366600265 + -9 = -0.633399735 p = -0.633399735 Simplifying p = -0.633399735

Subproblem 2

p + 9 = -8.366600265 Simplifying p + 9 = -8.366600265 Reorder the terms: 9 + p = -8.366600265 Solving 9 + p = -8.366600265 Solving for variable 'p'. Move all terms containing p to the left, all other terms to the right. Add '-9' to each side of the equation. 9 + -9 + p = -8.366600265 + -9 Combine like terms: 9 + -9 = 0 0 + p = -8.366600265 + -9 p = -8.366600265 + -9 Combine like terms: -8.366600265 + -9 = -17.366600265 p = -17.366600265 Simplifying p = -17.366600265

Solution

The solution to the problem is based on the solutions from the subproblems. p = {-0.633399735, -17.366600265}

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