2p^2+4p-5=0

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Solution for 2p^2+4p-5=0 equation:


Simplifying
2p2 + 4p + -5 = 0

Reorder the terms:
-5 + 4p + 2p2 = 0

Solving
-5 + 4p + 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'.
-2.5 + 2p + p2 = 0

Move the constant term to the right:

Add '2.5' to each side of the equation.
-2.5 + 2p + 2.5 + p2 = 0 + 2.5

Reorder the terms:
-2.5 + 2.5 + 2p + p2 = 0 + 2.5

Combine like terms: -2.5 + 2.5 = 0.0
0.0 + 2p + p2 = 0 + 2.5
2p + p2 = 0 + 2.5

Combine like terms: 0 + 2.5 = 2.5
2p + p2 = 2.5

The p term is 2p.  Take half its coefficient (1).
Square it (1) and add it to both sides.

Add '1' to each side of the equation.
2p + 1 + p2 = 2.5 + 1

Reorder the terms:
1 + 2p + p2 = 2.5 + 1

Combine like terms: 2.5 + 1 = 3.5
1 + 2p + p2 = 3.5

Factor a perfect square on the left side:
(p + 1)(p + 1) = 3.5

Calculate the square root of the right side: 1.870828693

Break this problem into two subproblems by setting 
(p + 1) equal to 1.870828693 and -1.870828693.

Subproblem 1

p + 1 = 1.870828693 Simplifying p + 1 = 1.870828693 Reorder the terms: 1 + p = 1.870828693 Solving 1 + p = 1.870828693 Solving for variable 'p'. Move all terms containing p to the left, all other terms to the right. Add '-1' to each side of the equation. 1 + -1 + p = 1.870828693 + -1 Combine like terms: 1 + -1 = 0 0 + p = 1.870828693 + -1 p = 1.870828693 + -1 Combine like terms: 1.870828693 + -1 = 0.870828693 p = 0.870828693 Simplifying p = 0.870828693

Subproblem 2

p + 1 = -1.870828693 Simplifying p + 1 = -1.870828693 Reorder the terms: 1 + p = -1.870828693 Solving 1 + p = -1.870828693 Solving for variable 'p'. Move all terms containing p to the left, all other terms to the right. Add '-1' to each side of the equation. 1 + -1 + p = -1.870828693 + -1 Combine like terms: 1 + -1 = 0 0 + p = -1.870828693 + -1 p = -1.870828693 + -1 Combine like terms: -1.870828693 + -1 = -2.870828693 p = -2.870828693 Simplifying p = -2.870828693

Solution

The solution to the problem is based on the solutions from the subproblems. p = {0.870828693, -2.870828693}

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