p^2-20p+100=28

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Solution for p^2-20p+100=28 equation:


Simplifying
p2 + -20p + 100 = 28

Reorder the terms:
100 + -20p + p2 = 28

Solving
100 + -20p + p2 = 28

Solving for variable 'p'.

Reorder the terms:
100 + -28 + -20p + p2 = 28 + -28

Combine like terms: 100 + -28 = 72
72 + -20p + p2 = 28 + -28

Combine like terms: 28 + -28 = 0
72 + -20p + p2 = 0

Begin completing the square.

Move the constant term to the right:

Add '-72' to each side of the equation.
72 + -20p + -72 + p2 = 0 + -72

Reorder the terms:
72 + -72 + -20p + p2 = 0 + -72

Combine like terms: 72 + -72 = 0
0 + -20p + p2 = 0 + -72
-20p + p2 = 0 + -72

Combine like terms: 0 + -72 = -72
-20p + p2 = -72

The p term is -20p.  Take half its coefficient (-10).
Square it (100) and add it to both sides.

Add '100' to each side of the equation.
-20p + 100 + p2 = -72 + 100

Reorder the terms:
100 + -20p + p2 = -72 + 100

Combine like terms: -72 + 100 = 28
100 + -20p + p2 = 28

Factor a perfect square on the left side:
(p + -10)(p + -10) = 28

Calculate the square root of the right side: 5.291502622

Break this problem into two subproblems by setting 
(p + -10) equal to 5.291502622 and -5.291502622.

Subproblem 1

p + -10 = 5.291502622 Simplifying p + -10 = 5.291502622 Reorder the terms: -10 + p = 5.291502622 Solving -10 + p = 5.291502622 Solving for variable 'p'. Move all terms containing p to the left, all other terms to the right. Add '10' to each side of the equation. -10 + 10 + p = 5.291502622 + 10 Combine like terms: -10 + 10 = 0 0 + p = 5.291502622 + 10 p = 5.291502622 + 10 Combine like terms: 5.291502622 + 10 = 15.291502622 p = 15.291502622 Simplifying p = 15.291502622

Subproblem 2

p + -10 = -5.291502622 Simplifying p + -10 = -5.291502622 Reorder the terms: -10 + p = -5.291502622 Solving -10 + p = -5.291502622 Solving for variable 'p'. Move all terms containing p to the left, all other terms to the right. Add '10' to each side of the equation. -10 + 10 + p = -5.291502622 + 10 Combine like terms: -10 + 10 = 0 0 + p = -5.291502622 + 10 p = -5.291502622 + 10 Combine like terms: -5.291502622 + 10 = 4.708497378 p = 4.708497378 Simplifying p = 4.708497378

Solution

The solution to the problem is based on the solutions from the subproblems. p = {15.291502622, 4.708497378}

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