2p^2+7p+2=0

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Solution for 2p^2+7p+2=0 equation:


Simplifying
2p2 + 7p + 2 = 0

Reorder the terms:
2 + 7p + 2p2 = 0

Solving
2 + 7p + 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'.
1 + 3.5p + p2 = 0

Move the constant term to the right:

Add '-1' to each side of the equation.
1 + 3.5p + -1 + p2 = 0 + -1

Reorder the terms:
1 + -1 + 3.5p + p2 = 0 + -1

Combine like terms: 1 + -1 = 0
0 + 3.5p + p2 = 0 + -1
3.5p + p2 = 0 + -1

Combine like terms: 0 + -1 = -1
3.5p + p2 = -1

The p term is 3.5p.  Take half its coefficient (1.75).
Square it (3.0625) and add it to both sides.

Add '3.0625' to each side of the equation.
3.5p + 3.0625 + p2 = -1 + 3.0625

Reorder the terms:
3.0625 + 3.5p + p2 = -1 + 3.0625

Combine like terms: -1 + 3.0625 = 2.0625
3.0625 + 3.5p + p2 = 2.0625

Factor a perfect square on the left side:
(p + 1.75)(p + 1.75) = 2.0625

Calculate the square root of the right side: 1.436140662

Break this problem into two subproblems by setting 
(p + 1.75) equal to 1.436140662 and -1.436140662.

Subproblem 1

p + 1.75 = 1.436140662 Simplifying p + 1.75 = 1.436140662 Reorder the terms: 1.75 + p = 1.436140662 Solving 1.75 + p = 1.436140662 Solving for variable 'p'. Move all terms containing p to the left, all other terms to the right. Add '-1.75' to each side of the equation. 1.75 + -1.75 + p = 1.436140662 + -1.75 Combine like terms: 1.75 + -1.75 = 0.00 0.00 + p = 1.436140662 + -1.75 p = 1.436140662 + -1.75 Combine like terms: 1.436140662 + -1.75 = -0.313859338 p = -0.313859338 Simplifying p = -0.313859338

Subproblem 2

p + 1.75 = -1.436140662 Simplifying p + 1.75 = -1.436140662 Reorder the terms: 1.75 + p = -1.436140662 Solving 1.75 + p = -1.436140662 Solving for variable 'p'. Move all terms containing p to the left, all other terms to the right. Add '-1.75' to each side of the equation. 1.75 + -1.75 + p = -1.436140662 + -1.75 Combine like terms: 1.75 + -1.75 = 0.00 0.00 + p = -1.436140662 + -1.75 p = -1.436140662 + -1.75 Combine like terms: -1.436140662 + -1.75 = -3.186140662 p = -3.186140662 Simplifying p = -3.186140662

Solution

The solution to the problem is based on the solutions from the subproblems. p = {-0.313859338, -3.186140662}

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