9p^2+18p-20=0

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Solution for 9p^2+18p-20=0 equation:


Simplifying
9p2 + 18p + -20 = 0

Reorder the terms:
-20 + 18p + 9p2 = 0

Solving
-20 + 18p + 9p2 = 0

Solving for variable 'p'.

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

Divide each side by '9'.
-2.222222222 + 2p + p2 = 0

Move the constant term to the right:

Add '2.222222222' to each side of the equation.
-2.222222222 + 2p + 2.222222222 + p2 = 0 + 2.222222222

Reorder the terms:
-2.222222222 + 2.222222222 + 2p + p2 = 0 + 2.222222222

Combine like terms: -2.222222222 + 2.222222222 = 0.000000000
0.000000000 + 2p + p2 = 0 + 2.222222222
2p + p2 = 0 + 2.222222222

Combine like terms: 0 + 2.222222222 = 2.222222222
2p + p2 = 2.222222222

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 = 2.222222222 + 1

Reorder the terms:
1 + 2p + p2 = 2.222222222 + 1

Combine like terms: 2.222222222 + 1 = 3.222222222
1 + 2p + p2 = 3.222222222

Factor a perfect square on the left side:
(p + 1)(p + 1) = 3.222222222

Calculate the square root of the right side: 1.795054936

Break this problem into two subproblems by setting 
(p + 1) equal to 1.795054936 and -1.795054936.

Subproblem 1

p + 1 = 1.795054936 Simplifying p + 1 = 1.795054936 Reorder the terms: 1 + p = 1.795054936 Solving 1 + p = 1.795054936 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 = 1.795054936 + -1 Combine like terms: 1 + -1 = 0 0 + p = 1.795054936 + -1 p = 1.795054936 + -1 Combine like terms: 1.795054936 + -1 = 0.795054936 p = 0.795054936 Simplifying p = 0.795054936

Subproblem 2

p + 1 = -1.795054936 Simplifying p + 1 = -1.795054936 Reorder the terms: 1 + p = -1.795054936 Solving 1 + p = -1.795054936 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 = -1.795054936 + -1 Combine like terms: 1 + -1 = 0 0 + p = -1.795054936 + -1 p = -1.795054936 + -1 Combine like terms: -1.795054936 + -1 = -2.795054936 p = -2.795054936 Simplifying p = -2.795054936

Solution

The solution to the problem is based on the solutions from the subproblems. p = {0.795054936, -2.795054936}

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