p^2=-13p+40

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Solution for p^2=-13p+40 equation:


Simplifying
p2 = -13p + 40

Reorder the terms:
p2 = 40 + -13p

Solving
p2 = 40 + -13p

Solving for variable 'p'.

Reorder the terms:
-40 + 13p + p2 = 40 + -13p + -40 + 13p

Reorder the terms:
-40 + 13p + p2 = 40 + -40 + -13p + 13p

Combine like terms: 40 + -40 = 0
-40 + 13p + p2 = 0 + -13p + 13p
-40 + 13p + p2 = -13p + 13p

Combine like terms: -13p + 13p = 0
-40 + 13p + p2 = 0

Begin completing the square.

Move the constant term to the right:

Add '40' to each side of the equation.
-40 + 13p + 40 + p2 = 0 + 40

Reorder the terms:
-40 + 40 + 13p + p2 = 0 + 40

Combine like terms: -40 + 40 = 0
0 + 13p + p2 = 0 + 40
13p + p2 = 0 + 40

Combine like terms: 0 + 40 = 40
13p + p2 = 40

The p term is 13p.  Take half its coefficient (6.5).
Square it (42.25) and add it to both sides.

Add '42.25' to each side of the equation.
13p + 42.25 + p2 = 40 + 42.25

Reorder the terms:
42.25 + 13p + p2 = 40 + 42.25

Combine like terms: 40 + 42.25 = 82.25
42.25 + 13p + p2 = 82.25

Factor a perfect square on the left side:
(p + 6.5)(p + 6.5) = 82.25

Calculate the square root of the right side: 9.069178574

Break this problem into two subproblems by setting 
(p + 6.5) equal to 9.069178574 and -9.069178574.

Subproblem 1

p + 6.5 = 9.069178574 Simplifying p + 6.5 = 9.069178574 Reorder the terms: 6.5 + p = 9.069178574 Solving 6.5 + p = 9.069178574 Solving for variable 'p'. Move all terms containing p to the left, all other terms to the right. Add '-6.5' to each side of the equation. 6.5 + -6.5 + p = 9.069178574 + -6.5 Combine like terms: 6.5 + -6.5 = 0.0 0.0 + p = 9.069178574 + -6.5 p = 9.069178574 + -6.5 Combine like terms: 9.069178574 + -6.5 = 2.569178574 p = 2.569178574 Simplifying p = 2.569178574

Subproblem 2

p + 6.5 = -9.069178574 Simplifying p + 6.5 = -9.069178574 Reorder the terms: 6.5 + p = -9.069178574 Solving 6.5 + p = -9.069178574 Solving for variable 'p'. Move all terms containing p to the left, all other terms to the right. Add '-6.5' to each side of the equation. 6.5 + -6.5 + p = -9.069178574 + -6.5 Combine like terms: 6.5 + -6.5 = 0.0 0.0 + p = -9.069178574 + -6.5 p = -9.069178574 + -6.5 Combine like terms: -9.069178574 + -6.5 = -15.569178574 p = -15.569178574 Simplifying p = -15.569178574

Solution

The solution to the problem is based on the solutions from the subproblems. p = {2.569178574, -15.569178574}

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