0=p^2-9p-4

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Solution for 0=p^2-9p-4 equation:


Simplifying
0 = p2 + -9p + -4

Reorder the terms:
0 = -4 + -9p + p2

Solving
0 = -4 + -9p + p2

Solving for variable 'p'.

Combine like terms: 0 + 4 = 4
4 + 9p + -1p2 = -4 + -9p + p2 + 4 + 9p + -1p2

Reorder the terms:
4 + 9p + -1p2 = -4 + 4 + -9p + 9p + p2 + -1p2

Combine like terms: -4 + 4 = 0
4 + 9p + -1p2 = 0 + -9p + 9p + p2 + -1p2
4 + 9p + -1p2 = -9p + 9p + p2 + -1p2

Combine like terms: -9p + 9p = 0
4 + 9p + -1p2 = 0 + p2 + -1p2
4 + 9p + -1p2 = p2 + -1p2

Combine like terms: p2 + -1p2 = 0
4 + 9p + -1p2 = 0

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

Divide each side by '-1'.
-4 + -9p + p2 = 0

Move the constant term to the right:

Add '4' to each side of the equation.
-4 + -9p + 4 + p2 = 0 + 4

Reorder the terms:
-4 + 4 + -9p + p2 = 0 + 4

Combine like terms: -4 + 4 = 0
0 + -9p + p2 = 0 + 4
-9p + p2 = 0 + 4

Combine like terms: 0 + 4 = 4
-9p + p2 = 4

The p term is -9p.  Take half its coefficient (-4.5).
Square it (20.25) and add it to both sides.

Add '20.25' to each side of the equation.
-9p + 20.25 + p2 = 4 + 20.25

Reorder the terms:
20.25 + -9p + p2 = 4 + 20.25

Combine like terms: 4 + 20.25 = 24.25
20.25 + -9p + p2 = 24.25

Factor a perfect square on the left side:
(p + -4.5)(p + -4.5) = 24.25

Calculate the square root of the right side: 4.924428901

Break this problem into two subproblems by setting 
(p + -4.5) equal to 4.924428901 and -4.924428901.

Subproblem 1

p + -4.5 = 4.924428901 Simplifying p + -4.5 = 4.924428901 Reorder the terms: -4.5 + p = 4.924428901 Solving -4.5 + p = 4.924428901 Solving for variable 'p'. Move all terms containing p to the left, all other terms to the right. Add '4.5' to each side of the equation. -4.5 + 4.5 + p = 4.924428901 + 4.5 Combine like terms: -4.5 + 4.5 = 0.0 0.0 + p = 4.924428901 + 4.5 p = 4.924428901 + 4.5 Combine like terms: 4.924428901 + 4.5 = 9.424428901 p = 9.424428901 Simplifying p = 9.424428901

Subproblem 2

p + -4.5 = -4.924428901 Simplifying p + -4.5 = -4.924428901 Reorder the terms: -4.5 + p = -4.924428901 Solving -4.5 + p = -4.924428901 Solving for variable 'p'. Move all terms containing p to the left, all other terms to the right. Add '4.5' to each side of the equation. -4.5 + 4.5 + p = -4.924428901 + 4.5 Combine like terms: -4.5 + 4.5 = 0.0 0.0 + p = -4.924428901 + 4.5 p = -4.924428901 + 4.5 Combine like terms: -4.924428901 + 4.5 = -0.424428901 p = -0.424428901 Simplifying p = -0.424428901

Solution

The solution to the problem is based on the solutions from the subproblems. p = {9.424428901, -0.424428901}

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