p^2+5p-7=0

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Solution for p^2+5p-7=0 equation: 


Simplifying
p2 + 5p + -7 = 0

Reorder the terms:
-7 + 5p + p2 = 0

Solving
-7 + 5p + p2 = 0

Solving for variable 'p'.

Begin completing the square.

Move the constant term to the right:

Add '7' to each side of the equation.
-7 + 5p + 7 + p2 = 0 + 7

Reorder the terms:
-7 + 7 + 5p + p2 = 0 + 7

Combine like terms: -7 + 7 = 0
0 + 5p + p2 = 0 + 7
5p + p2 = 0 + 7

Combine like terms: 0 + 7 = 7
5p + p2 = 7

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 = 7 + 6.25

Reorder the terms:
6.25 + 5p + p2 = 7 + 6.25

Combine like terms: 7 + 6.25 = 13.25
6.25 + 5p + p2 = 13.25

Factor a perfect square on the left side:
(p + 2.5)(p + 2.5) = 13.25

Calculate the square root of the right side: 3.640054945

Break this problem into two subproblems by setting 
(p + 2.5) equal to 3.640054945 and -3.640054945.


Subproblem 1
p + 2.5 = 3.640054945

Simplifying
p + 2.5 = 3.640054945

Reorder the terms:
2.5 + p = 3.640054945

Solving
2.5 + p = 3.640054945

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 = 3.640054945 + -2.5

Combine like terms: 2.5 + -2.5 = 0.0
0.0 + p = 3.640054945 + -2.5
p = 3.640054945 + -2.5

Combine like terms: 3.640054945 + -2.5 = 1.140054945
p = 1.140054945

Simplifying
p = 1.140054945


Subproblem 2
p + 2.5 = -3.640054945

Simplifying
p + 2.5 = -3.640054945

Reorder the terms:
2.5 + p = -3.640054945

Solving
2.5 + p = -3.640054945

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 = -3.640054945 + -2.5

Combine like terms: 2.5 + -2.5 = 0.0
0.0 + p = -3.640054945 + -2.5
p = -3.640054945 + -2.5

Combine like terms: -3.640054945 + -2.5 = -6.140054945
p = -6.140054945

Simplifying
p = -6.140054945


Solution
The solution to the problem is based on the solutions
from the subproblems.
p = {1.140054945, -6.140054945}

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