-p^2-5p+16=0

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Solution for -p^2-5p+16=0 equation: 


Simplifying
-1p2 + -5p + 16 = 0

Reorder the terms:
16 + -5p + -1p2 = 0

Solving
16 + -5p + -1p2 = 0

Solving for variable 'p'.

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

Divide each side by '-1'.
-16 + 5p + p2 = 0

Move the constant term to the right:

Add '16' to each side of the equation.
-16 + 5p + 16 + p2 = 0 + 16

Reorder the terms:
-16 + 16 + 5p + p2 = 0 + 16

Combine like terms: -16 + 16 = 0
0 + 5p + p2 = 0 + 16
5p + p2 = 0 + 16

Combine like terms: 0 + 16 = 16
5p + p2 = 16

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 = 16 + 6.25

Reorder the terms:
6.25 + 5p + p2 = 16 + 6.25

Combine like terms: 16 + 6.25 = 22.25
6.25 + 5p + p2 = 22.25

Factor a perfect square on the left side:
(p + 2.5)(p + 2.5) = 22.25

Calculate the square root of the right side: 4.716990566

Break this problem into two subproblems by setting 
(p + 2.5) equal to 4.716990566 and -4.716990566.


Subproblem 1
p + 2.5 = 4.716990566

Simplifying
p + 2.5 = 4.716990566

Reorder the terms:
2.5 + p = 4.716990566

Solving
2.5 + p = 4.716990566

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 = 4.716990566 + -2.5

Combine like terms: 2.5 + -2.5 = 0.0
0.0 + p = 4.716990566 + -2.5
p = 4.716990566 + -2.5

Combine like terms: 4.716990566 + -2.5 = 2.216990566
p = 2.216990566

Simplifying
p = 2.216990566


Subproblem 2
p + 2.5 = -4.716990566

Simplifying
p + 2.5 = -4.716990566

Reorder the terms:
2.5 + p = -4.716990566

Solving
2.5 + p = -4.716990566

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 = -4.716990566 + -2.5

Combine like terms: 2.5 + -2.5 = 0.0
0.0 + p = -4.716990566 + -2.5
p = -4.716990566 + -2.5

Combine like terms: -4.716990566 + -2.5 = -7.216990566
p = -7.216990566

Simplifying
p = -7.216990566


Solution
The solution to the problem is based on the solutions
from the subproblems.
p = {2.216990566, -7.216990566}

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