9=p^2+18p

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Solution for 9=p^2+18p equation:


Simplifying
9 = p2 + 18p

Reorder the terms:
9 = 18p + p2

Solving
9 = 18p + p2

Solving for variable 'p'.

Reorder the terms:
9 + -18p + -1p2 = 18p + -18p + p2 + -1p2

Combine like terms: 18p + -18p = 0
9 + -18p + -1p2 = 0 + p2 + -1p2
9 + -18p + -1p2 = p2 + -1p2

Combine like terms: p2 + -1p2 = 0
9 + -18p + -1p2 = 0

Begin completing the square.  Divide all terms by
-1 the coefficient of the squared term: 

Divide each side by '-1'.
-9 + 18p + p2 = 0

Move the constant term to the right:

Add '9' to each side of the equation.
-9 + 18p + 9 + p2 = 0 + 9

Reorder the terms:
-9 + 9 + 18p + p2 = 0 + 9

Combine like terms: -9 + 9 = 0
0 + 18p + p2 = 0 + 9
18p + p2 = 0 + 9

Combine like terms: 0 + 9 = 9
18p + p2 = 9

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 = 9 + 81

Reorder the terms:
81 + 18p + p2 = 9 + 81

Combine like terms: 9 + 81 = 90
81 + 18p + p2 = 90

Factor a perfect square on the left side:
(p + 9)(p + 9) = 90

Calculate the square root of the right side: 9.486832981

Break this problem into two subproblems by setting 
(p + 9) equal to 9.486832981 and -9.486832981.

Subproblem 1

p + 9 = 9.486832981 Simplifying p + 9 = 9.486832981 Reorder the terms: 9 + p = 9.486832981 Solving 9 + p = 9.486832981 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 = 9.486832981 + -9 Combine like terms: 9 + -9 = 0 0 + p = 9.486832981 + -9 p = 9.486832981 + -9 Combine like terms: 9.486832981 + -9 = 0.486832981 p = 0.486832981 Simplifying p = 0.486832981

Subproblem 2

p + 9 = -9.486832981 Simplifying p + 9 = -9.486832981 Reorder the terms: 9 + p = -9.486832981 Solving 9 + p = -9.486832981 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 = -9.486832981 + -9 Combine like terms: 9 + -9 = 0 0 + p = -9.486832981 + -9 p = -9.486832981 + -9 Combine like terms: -9.486832981 + -9 = -18.486832981 p = -18.486832981 Simplifying p = -18.486832981

Solution

The solution to the problem is based on the solutions from the subproblems. p = {0.486832981, -18.486832981}

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