3p^2+15p+1=0

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Solution for 3p^2+15p+1=0 equation:


Simplifying
3p2 + 15p + 1 = 0

Reorder the terms:
1 + 15p + 3p2 = 0

Solving
1 + 15p + 3p2 = 0

Solving for variable 'p'.

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

Divide each side by '3'.
0.3333333333 + 5p + p2 = 0

Move the constant term to the right:

Add '-0.3333333333' to each side of the equation.
0.3333333333 + 5p + -0.3333333333 + p2 = 0 + -0.3333333333

Reorder the terms:
0.3333333333 + -0.3333333333 + 5p + p2 = 0 + -0.3333333333

Combine like terms: 0.3333333333 + -0.3333333333 = 0.0000000000
0.0000000000 + 5p + p2 = 0 + -0.3333333333
5p + p2 = 0 + -0.3333333333

Combine like terms: 0 + -0.3333333333 = -0.3333333333
5p + p2 = -0.3333333333

The p term is 5p.  Take half its coefficient (2.5).
Square it (6.25) and add it to both sides.

Add '6.25' to each side of the equation.
5p + 6.25 + p2 = -0.3333333333 + 6.25

Reorder the terms:
6.25 + 5p + p2 = -0.3333333333 + 6.25

Combine like terms: -0.3333333333 + 6.25 = 5.9166666667
6.25 + 5p + p2 = 5.9166666667

Factor a perfect square on the left side:
(p + 2.5)(p + 2.5) = 5.9166666667

Calculate the square root of the right side: 2.43241992

Break this problem into two subproblems by setting 
(p + 2.5) equal to 2.43241992 and -2.43241992.

Subproblem 1

p + 2.5 = 2.43241992 Simplifying p + 2.5 = 2.43241992 Reorder the terms: 2.5 + p = 2.43241992 Solving 2.5 + p = 2.43241992 Solving for variable 'p'. Move all terms containing p to the left, all other terms to the right. Add '-2.5' to each side of the equation. 2.5 + -2.5 + p = 2.43241992 + -2.5 Combine like terms: 2.5 + -2.5 = 0.0 0.0 + p = 2.43241992 + -2.5 p = 2.43241992 + -2.5 Combine like terms: 2.43241992 + -2.5 = -0.06758008 p = -0.06758008 Simplifying p = -0.06758008

Subproblem 2

p + 2.5 = -2.43241992 Simplifying p + 2.5 = -2.43241992 Reorder the terms: 2.5 + p = -2.43241992 Solving 2.5 + p = -2.43241992 Solving for variable 'p'. Move all terms containing p to the left, all other terms to the right. Add '-2.5' to each side of the equation. 2.5 + -2.5 + p = -2.43241992 + -2.5 Combine like terms: 2.5 + -2.5 = 0.0 0.0 + p = -2.43241992 + -2.5 p = -2.43241992 + -2.5 Combine like terms: -2.43241992 + -2.5 = -4.93241992 p = -4.93241992 Simplifying p = -4.93241992

Solution

The solution to the problem is based on the solutions from the subproblems. p = {-0.06758008, -4.93241992}

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