p^2-18p+66=0

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Solution for p^2-18p+66=0 equation:


Simplifying
p2 + -18p + 66 = 0

Reorder the terms:
66 + -18p + p2 = 0

Solving
66 + -18p + p2 = 0

Solving for variable 'p'.

Begin completing the square.

Move the constant term to the right:

Add '-66' to each side of the equation.
66 + -18p + -66 + p2 = 0 + -66

Reorder the terms:
66 + -66 + -18p + p2 = 0 + -66

Combine like terms: 66 + -66 = 0
0 + -18p + p2 = 0 + -66
-18p + p2 = 0 + -66

Combine like terms: 0 + -66 = -66
-18p + p2 = -66

The p term is -18p.  Take half its coefficient (-9).
Square it (81) and add it to both sides.

Add '81' to each side of the equation.
-18p + 81 + p2 = -66 + 81

Reorder the terms:
81 + -18p + p2 = -66 + 81

Combine like terms: -66 + 81 = 15
81 + -18p + p2 = 15

Factor a perfect square on the left side:
(p + -9)(p + -9) = 15

Calculate the square root of the right side: 3.872983346

Break this problem into two subproblems by setting 
(p + -9) equal to 3.872983346 and -3.872983346.

Subproblem 1

p + -9 = 3.872983346 Simplifying p + -9 = 3.872983346 Reorder the terms: -9 + p = 3.872983346 Solving -9 + p = 3.872983346 Solving for variable 'p'. Move all terms containing p to the left, all other terms to the right. Add '9' to each side of the equation. -9 + 9 + p = 3.872983346 + 9 Combine like terms: -9 + 9 = 0 0 + p = 3.872983346 + 9 p = 3.872983346 + 9 Combine like terms: 3.872983346 + 9 = 12.872983346 p = 12.872983346 Simplifying p = 12.872983346

Subproblem 2

p + -9 = -3.872983346 Simplifying p + -9 = -3.872983346 Reorder the terms: -9 + p = -3.872983346 Solving -9 + p = -3.872983346 Solving for variable 'p'. Move all terms containing p to the left, all other terms to the right. Add '9' to each side of the equation. -9 + 9 + p = -3.872983346 + 9 Combine like terms: -9 + 9 = 0 0 + p = -3.872983346 + 9 p = -3.872983346 + 9 Combine like terms: -3.872983346 + 9 = 5.127016654 p = 5.127016654 Simplifying p = 5.127016654

Solution

The solution to the problem is based on the solutions from the subproblems. p = {12.872983346, 5.127016654}

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