(p-1)(2p+4)=9

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Solution for (p-1)(2p+4)=9 equation:


Simplifying
(p + -1)(2p + 4) = 9

Reorder the terms:
(-1 + p)(2p + 4) = 9

Reorder the terms:
(-1 + p)(4 + 2p) = 9

Multiply (-1 + p) * (4 + 2p)
(-1(4 + 2p) + p(4 + 2p)) = 9
((4 * -1 + 2p * -1) + p(4 + 2p)) = 9
((-4 + -2p) + p(4 + 2p)) = 9
(-4 + -2p + (4 * p + 2p * p)) = 9
(-4 + -2p + (4p + 2p2)) = 9

Combine like terms: -2p + 4p = 2p
(-4 + 2p + 2p2) = 9

Solving
-4 + 2p + 2p2 = 9

Solving for variable 'p'.

Reorder the terms:
-4 + -9 + 2p + 2p2 = 9 + -9

Combine like terms: -4 + -9 = -13
-13 + 2p + 2p2 = 9 + -9

Combine like terms: 9 + -9 = 0
-13 + 2p + 2p2 = 0

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

Divide each side by '2'.
-6.5 + p + p2 = 0

Move the constant term to the right:

Add '6.5' to each side of the equation.
-6.5 + p + 6.5 + p2 = 0 + 6.5

Reorder the terms:
-6.5 + 6.5 + p + p2 = 0 + 6.5

Combine like terms: -6.5 + 6.5 = 0.0
0.0 + p + p2 = 0 + 6.5
p + p2 = 0 + 6.5

Combine like terms: 0 + 6.5 = 6.5
p + p2 = 6.5

The p term is p.  Take half its coefficient (0.5).
Square it (0.25) and add it to both sides.

Add '0.25' to each side of the equation.
 + 0.25 + p2 = 6.5 + 0.25

Combine like terms:  + 0.25 = 1.25
1.25 + p2 = 6.5 + 0.25

Combine like terms: 6.5 + 0.25 = 6.75
1.25 + p2 = 6.75

Factor a perfect square on the left side:
(p + 0.5)(p + 0.5) = 6.75

Calculate the square root of the right side: 2.598076211

Break this problem into two subproblems by setting 
(p + 0.5) equal to 2.598076211 and -2.598076211.

Subproblem 1

p + 0.5 = 2.598076211 Simplifying p + 0.5 = 2.598076211 Reorder the terms: 0.5 + p = 2.598076211 Solving 0.5 + p = 2.598076211 Solving for variable 'p'. Move all terms containing p to the left, all other terms to the right. Add '-0.5' to each side of the equation. 0.5 + -0.5 + p = 2.598076211 + -0.5 Combine like terms: 0.5 + -0.5 = 0.0 0.0 + p = 2.598076211 + -0.5 p = 2.598076211 + -0.5 Combine like terms: 2.598076211 + -0.5 = 2.098076211 p = 2.098076211 Simplifying p = 2.098076211

Subproblem 2

p + 0.5 = -2.598076211 Simplifying p + 0.5 = -2.598076211 Reorder the terms: 0.5 + p = -2.598076211 Solving 0.5 + p = -2.598076211 Solving for variable 'p'. Move all terms containing p to the left, all other terms to the right. Add '-0.5' to each side of the equation. 0.5 + -0.5 + p = -2.598076211 + -0.5 Combine like terms: 0.5 + -0.5 = 0.0 0.0 + p = -2.598076211 + -0.5 p = -2.598076211 + -0.5 Combine like terms: -2.598076211 + -0.5 = -3.098076211 p = -3.098076211 Simplifying p = -3.098076211

Solution

The solution to the problem is based on the solutions from the subproblems. p = {2.098076211, -3.098076211}

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