2p^2+9p+1=0

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Solution for 2p^2+9p+1=0 equation:


Simplifying
2p2 + 9p + 1 = 0

Reorder the terms:
1 + 9p + 2p2 = 0

Solving
1 + 9p + 2p2 = 0

Solving for variable 'p'.

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

Divide each side by '2'.
0.5 + 4.5p + p2 = 0

Move the constant term to the right:

Add '-0.5' to each side of the equation.
0.5 + 4.5p + -0.5 + p2 = 0 + -0.5

Reorder the terms:
0.5 + -0.5 + 4.5p + p2 = 0 + -0.5

Combine like terms: 0.5 + -0.5 = 0.0
0.0 + 4.5p + p2 = 0 + -0.5
4.5p + p2 = 0 + -0.5

Combine like terms: 0 + -0.5 = -0.5
4.5p + p2 = -0.5

The p term is 4.5p.  Take half its coefficient (2.25).
Square it (5.0625) and add it to both sides.

Add '5.0625' to each side of the equation.
4.5p + 5.0625 + p2 = -0.5 + 5.0625

Reorder the terms:
5.0625 + 4.5p + p2 = -0.5 + 5.0625

Combine like terms: -0.5 + 5.0625 = 4.5625
5.0625 + 4.5p + p2 = 4.5625

Factor a perfect square on the left side:
(p + 2.25)(p + 2.25) = 4.5625

Calculate the square root of the right side: 2.136000936

Break this problem into two subproblems by setting 
(p + 2.25) equal to 2.136000936 and -2.136000936.

Subproblem 1

p + 2.25 = 2.136000936 Simplifying p + 2.25 = 2.136000936 Reorder the terms: 2.25 + p = 2.136000936 Solving 2.25 + p = 2.136000936 Solving for variable 'p'. Move all terms containing p to the left, all other terms to the right. Add '-2.25' to each side of the equation. 2.25 + -2.25 + p = 2.136000936 + -2.25 Combine like terms: 2.25 + -2.25 = 0.00 0.00 + p = 2.136000936 + -2.25 p = 2.136000936 + -2.25 Combine like terms: 2.136000936 + -2.25 = -0.113999064 p = -0.113999064 Simplifying p = -0.113999064

Subproblem 2

p + 2.25 = -2.136000936 Simplifying p + 2.25 = -2.136000936 Reorder the terms: 2.25 + p = -2.136000936 Solving 2.25 + p = -2.136000936 Solving for variable 'p'. Move all terms containing p to the left, all other terms to the right. Add '-2.25' to each side of the equation. 2.25 + -2.25 + p = -2.136000936 + -2.25 Combine like terms: 2.25 + -2.25 = 0.00 0.00 + p = -2.136000936 + -2.25 p = -2.136000936 + -2.25 Combine like terms: -2.136000936 + -2.25 = -4.386000936 p = -4.386000936 Simplifying p = -4.386000936

Solution

The solution to the problem is based on the solutions from the subproblems. p = {-0.113999064, -4.386000936}

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