4=2-5p+p^2

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


Simplifying
4 = 2 + -5p + p2

Solving
4 = 2 + -5p + p2

Solving for variable 'p'.

Combine like terms: 4 + -2 = 2
2 + 5p + -1p2 = 2 + -5p + p2 + -2 + 5p + -1p2

Reorder the terms:
2 + 5p + -1p2 = 2 + -2 + -5p + 5p + p2 + -1p2

Combine like terms: 2 + -2 = 0
2 + 5p + -1p2 = 0 + -5p + 5p + p2 + -1p2
2 + 5p + -1p2 = -5p + 5p + p2 + -1p2

Combine like terms: -5p + 5p = 0
2 + 5p + -1p2 = 0 + p2 + -1p2
2 + 5p + -1p2 = p2 + -1p2

Combine like terms: p2 + -1p2 = 0
2 + 5p + -1p2 = 0

Begin completing the square.  Divide all terms by
-1 the coefficient of the squared term: 

Divide each side by '-1'.
-2 + -5p + p2 = 0

Move the constant term to the right:

Add '2' to each side of the equation.
-2 + -5p + 2 + p2 = 0 + 2

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

Combine like terms: -2 + 2 = 0
0 + -5p + p2 = 0 + 2
-5p + p2 = 0 + 2

Combine like terms: 0 + 2 = 2
-5p + p2 = 2

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 = 2 + 6.25

Reorder the terms:
6.25 + -5p + p2 = 2 + 6.25

Combine like terms: 2 + 6.25 = 8.25
6.25 + -5p + p2 = 8.25

Factor a perfect square on the left side:
(p + -2.5)(p + -2.5) = 8.25

Calculate the square root of the right side: 2.872281323

Break this problem into two subproblems by setting 
(p + -2.5) equal to 2.872281323 and -2.872281323.

Subproblem 1

p + -2.5 = 2.872281323 Simplifying p + -2.5 = 2.872281323 Reorder the terms: -2.5 + p = 2.872281323 Solving -2.5 + p = 2.872281323 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 = 2.872281323 + 2.5 Combine like terms: -2.5 + 2.5 = 0.0 0.0 + p = 2.872281323 + 2.5 p = 2.872281323 + 2.5 Combine like terms: 2.872281323 + 2.5 = 5.372281323 p = 5.372281323 Simplifying p = 5.372281323

Subproblem 2

p + -2.5 = -2.872281323 Simplifying p + -2.5 = -2.872281323 Reorder the terms: -2.5 + p = -2.872281323 Solving -2.5 + p = -2.872281323 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 = -2.872281323 + 2.5 Combine like terms: -2.5 + 2.5 = 0.0 0.0 + p = -2.872281323 + 2.5 p = -2.872281323 + 2.5 Combine like terms: -2.872281323 + 2.5 = -0.372281323 p = -0.372281323 Simplifying p = -0.372281323

Solution

The solution to the problem is based on the solutions from the subproblems. p = {5.372281323, -0.372281323}

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