9p^2=2p+20

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Solution for 9p^2=2p+20 equation:


Simplifying
9p2 = 2p + 20

Reorder the terms:
9p2 = 20 + 2p

Solving
9p2 = 20 + 2p

Solving for variable 'p'.

Reorder the terms:
-20 + -2p + 9p2 = 20 + 2p + -20 + -2p

Reorder the terms:
-20 + -2p + 9p2 = 20 + -20 + 2p + -2p

Combine like terms: 20 + -20 = 0
-20 + -2p + 9p2 = 0 + 2p + -2p
-20 + -2p + 9p2 = 2p + -2p

Combine like terms: 2p + -2p = 0
-20 + -2p + 9p2 = 0

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

Divide each side by '9'.
-2.222222222 + -0.2222222222p + p2 = 0

Move the constant term to the right:

Add '2.222222222' to each side of the equation.
-2.222222222 + -0.2222222222p + 2.222222222 + p2 = 0 + 2.222222222

Reorder the terms:
-2.222222222 + 2.222222222 + -0.2222222222p + p2 = 0 + 2.222222222

Combine like terms: -2.222222222 + 2.222222222 = 0.000000000
0.000000000 + -0.2222222222p + p2 = 0 + 2.222222222
-0.2222222222p + p2 = 0 + 2.222222222

Combine like terms: 0 + 2.222222222 = 2.222222222
-0.2222222222p + p2 = 2.222222222

The p term is -0.2222222222p.  Take half its coefficient (-0.1111111111).
Square it (0.01234567901) and add it to both sides.

Add '0.01234567901' to each side of the equation.
-0.2222222222p + 0.01234567901 + p2 = 2.222222222 + 0.01234567901

Reorder the terms:
0.01234567901 + -0.2222222222p + p2 = 2.222222222 + 0.01234567901

Combine like terms: 2.222222222 + 0.01234567901 = 2.23456790101
0.01234567901 + -0.2222222222p + p2 = 2.23456790101

Factor a perfect square on the left side:
(p + -0.1111111111)(p + -0.1111111111) = 2.23456790101

Calculate the square root of the right side: 1.494847116

Break this problem into two subproblems by setting 
(p + -0.1111111111) equal to 1.494847116 and -1.494847116.

Subproblem 1

p + -0.1111111111 = 1.494847116 Simplifying p + -0.1111111111 = 1.494847116 Reorder the terms: -0.1111111111 + p = 1.494847116 Solving -0.1111111111 + p = 1.494847116 Solving for variable 'p'. Move all terms containing p to the left, all other terms to the right. Add '0.1111111111' to each side of the equation. -0.1111111111 + 0.1111111111 + p = 1.494847116 + 0.1111111111 Combine like terms: -0.1111111111 + 0.1111111111 = 0.0000000000 0.0000000000 + p = 1.494847116 + 0.1111111111 p = 1.494847116 + 0.1111111111 Combine like terms: 1.494847116 + 0.1111111111 = 1.6059582271 p = 1.6059582271 Simplifying p = 1.6059582271

Subproblem 2

p + -0.1111111111 = -1.494847116 Simplifying p + -0.1111111111 = -1.494847116 Reorder the terms: -0.1111111111 + p = -1.494847116 Solving -0.1111111111 + p = -1.494847116 Solving for variable 'p'. Move all terms containing p to the left, all other terms to the right. Add '0.1111111111' to each side of the equation. -0.1111111111 + 0.1111111111 + p = -1.494847116 + 0.1111111111 Combine like terms: -0.1111111111 + 0.1111111111 = 0.0000000000 0.0000000000 + p = -1.494847116 + 0.1111111111 p = -1.494847116 + 0.1111111111 Combine like terms: -1.494847116 + 0.1111111111 = -1.3837360049 p = -1.3837360049 Simplifying p = -1.3837360049

Solution

The solution to the problem is based on the solutions from the subproblems. p = {1.6059582271, -1.3837360049}

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