9p(9p+10)=25

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Solution for 9p(9p+10)=25 equation:


Simplifying
9p(9p + 10) = 25

Reorder the terms:
9p(10 + 9p) = 25
(10 * 9p + 9p * 9p) = 25
(90p + 81p2) = 25

Solving
90p + 81p2 = 25

Solving for variable 'p'.

Reorder the terms:
-25 + 90p + 81p2 = 25 + -25

Combine like terms: 25 + -25 = 0
-25 + 90p + 81p2 = 0

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

Divide each side by '81'.
-0.3086419753 + 1.111111111p + p2 = 0

Move the constant term to the right:

Add '0.3086419753' to each side of the equation.
-0.3086419753 + 1.111111111p + 0.3086419753 + p2 = 0 + 0.3086419753

Reorder the terms:
-0.3086419753 + 0.3086419753 + 1.111111111p + p2 = 0 + 0.3086419753

Combine like terms: -0.3086419753 + 0.3086419753 = 0.0000000000
0.0000000000 + 1.111111111p + p2 = 0 + 0.3086419753
1.111111111p + p2 = 0 + 0.3086419753

Combine like terms: 0 + 0.3086419753 = 0.3086419753
1.111111111p + p2 = 0.3086419753

The p term is 1.111111111p.  Take half its coefficient (0.5555555555).
Square it (0.3086419752) and add it to both sides.

Add '0.3086419752' to each side of the equation.
1.111111111p + 0.3086419752 + p2 = 0.3086419753 + 0.3086419752

Reorder the terms:
0.3086419752 + 1.111111111p + p2 = 0.3086419753 + 0.3086419752

Combine like terms: 0.3086419753 + 0.3086419752 = 0.6172839505
0.3086419752 + 1.111111111p + p2 = 0.6172839505

Factor a perfect square on the left side:
(p + 0.5555555555)(p + 0.5555555555) = 0.6172839505

Calculate the square root of the right side: 0.785674201

Break this problem into two subproblems by setting 
(p + 0.5555555555) equal to 0.785674201 and -0.785674201.

Subproblem 1

p + 0.5555555555 = 0.785674201 Simplifying p + 0.5555555555 = 0.785674201 Reorder the terms: 0.5555555555 + p = 0.785674201 Solving 0.5555555555 + p = 0.785674201 Solving for variable 'p'. Move all terms containing p to the left, all other terms to the right. Add '-0.5555555555' to each side of the equation. 0.5555555555 + -0.5555555555 + p = 0.785674201 + -0.5555555555 Combine like terms: 0.5555555555 + -0.5555555555 = 0.0000000000 0.0000000000 + p = 0.785674201 + -0.5555555555 p = 0.785674201 + -0.5555555555 Combine like terms: 0.785674201 + -0.5555555555 = 0.2301186455 p = 0.2301186455 Simplifying p = 0.2301186455

Subproblem 2

p + 0.5555555555 = -0.785674201 Simplifying p + 0.5555555555 = -0.785674201 Reorder the terms: 0.5555555555 + p = -0.785674201 Solving 0.5555555555 + p = -0.785674201 Solving for variable 'p'. Move all terms containing p to the left, all other terms to the right. Add '-0.5555555555' to each side of the equation. 0.5555555555 + -0.5555555555 + p = -0.785674201 + -0.5555555555 Combine like terms: 0.5555555555 + -0.5555555555 = 0.0000000000 0.0000000000 + p = -0.785674201 + -0.5555555555 p = -0.785674201 + -0.5555555555 Combine like terms: -0.785674201 + -0.5555555555 = -1.3412297565 p = -1.3412297565 Simplifying p = -1.3412297565

Solution

The solution to the problem is based on the solutions from the subproblems. p = {0.2301186455, -1.3412297565}

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