P^2+2P=0.87

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Solution for P^2+2P=0.87 equation:


Simplifying
P2 + 2P = 0.87

Reorder the terms:
2P + P2 = 0.87

Solving
2P + P2 = 0.87

Solving for variable 'P'.

Reorder the terms:
-0.87 + 2P + P2 = 0.87 + -0.87

Combine like terms: 0.87 + -0.87 = 0.00
-0.87 + 2P + P2 = 0.00

Begin completing the square.

Move the constant term to the right:

Add '0.87' to each side of the equation.
-0.87 + 2P + 0.87 + P2 = 0.00 + 0.87

Reorder the terms:
-0.87 + 0.87 + 2P + P2 = 0.00 + 0.87

Combine like terms: -0.87 + 0.87 = 0.00
0.00 + 2P + P2 = 0.00 + 0.87
2P + P2 = 0.00 + 0.87

Combine like terms: 0.00 + 0.87 = 0.87
2P + P2 = 0.87

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 = 0.87 + 1

Reorder the terms:
1 + 2P + P2 = 0.87 + 1

Combine like terms: 0.87 + 1 = 1.87
1 + 2P + P2 = 1.87

Factor a perfect square on the left side:
(P + 1)(P + 1) = 1.87

Calculate the square root of the right side: 1.367479433

Break this problem into two subproblems by setting 
(P + 1) equal to 1.367479433 and -1.367479433.

Subproblem 1

P + 1 = 1.367479433 Simplifying P + 1 = 1.367479433 Reorder the terms: 1 + P = 1.367479433 Solving 1 + P = 1.367479433 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 = 1.367479433 + -1 Combine like terms: 1 + -1 = 0 0 + P = 1.367479433 + -1 P = 1.367479433 + -1 Combine like terms: 1.367479433 + -1 = 0.367479433 P = 0.367479433 Simplifying P = 0.367479433

Subproblem 2

P + 1 = -1.367479433 Simplifying P + 1 = -1.367479433 Reorder the terms: 1 + P = -1.367479433 Solving 1 + P = -1.367479433 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 = -1.367479433 + -1 Combine like terms: 1 + -1 = 0 0 + P = -1.367479433 + -1 P = -1.367479433 + -1 Combine like terms: -1.367479433 + -1 = -2.367479433 P = -2.367479433 Simplifying P = -2.367479433

Solution

The solution to the problem is based on the solutions from the subproblems. P = {0.367479433, -2.367479433}

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