p^2-9p-100=0

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Solution for p^2-9p-100=0 equation:


Simplifying
p2 + -9p + -100 = 0

Reorder the terms:
-100 + -9p + p2 = 0

Solving
-100 + -9p + p2 = 0

Solving for variable 'p'.

Begin completing the square.

Move the constant term to the right:

Add '100' to each side of the equation.
-100 + -9p + 100 + p2 = 0 + 100

Reorder the terms:
-100 + 100 + -9p + p2 = 0 + 100

Combine like terms: -100 + 100 = 0
0 + -9p + p2 = 0 + 100
-9p + p2 = 0 + 100

Combine like terms: 0 + 100 = 100
-9p + p2 = 100

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 = 100 + 20.25

Reorder the terms:
20.25 + -9p + p2 = 100 + 20.25

Combine like terms: 100 + 20.25 = 120.25
20.25 + -9p + p2 = 120.25

Factor a perfect square on the left side:
(p + -4.5)(p + -4.5) = 120.25

Calculate the square root of the right side: 10.9658561

Break this problem into two subproblems by setting 
(p + -4.5) equal to 10.9658561 and -10.9658561.

Subproblem 1

p + -4.5 = 10.9658561 Simplifying p + -4.5 = 10.9658561 Reorder the terms: -4.5 + p = 10.9658561 Solving -4.5 + p = 10.9658561 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 = 10.9658561 + 4.5 Combine like terms: -4.5 + 4.5 = 0.0 0.0 + p = 10.9658561 + 4.5 p = 10.9658561 + 4.5 Combine like terms: 10.9658561 + 4.5 = 15.4658561 p = 15.4658561 Simplifying p = 15.4658561

Subproblem 2

p + -4.5 = -10.9658561 Simplifying p + -4.5 = -10.9658561 Reorder the terms: -4.5 + p = -10.9658561 Solving -4.5 + p = -10.9658561 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 = -10.9658561 + 4.5 Combine like terms: -4.5 + 4.5 = 0.0 0.0 + p = -10.9658561 + 4.5 p = -10.9658561 + 4.5 Combine like terms: -10.9658561 + 4.5 = -6.4658561 p = -6.4658561 Simplifying p = -6.4658561

Solution

The solution to the problem is based on the solutions from the subproblems. p = {15.4658561, -6.4658561}

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