b^2+5b-2=0

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Solution for b^2+5b-2=0 equation: 


Simplifying
b2 + 5b + -2 = 0

Reorder the terms:
-2 + 5b + b2 = 0

Solving
-2 + 5b + b2 = 0

Solving for variable 'b'.

Begin completing the square.

Move the constant term to the right:

Add '2' to each side of the equation.
-2 + 5b + 2 + b2 = 0 + 2

Reorder the terms:
-2 + 2 + 5b + b2 = 0 + 2

Combine like terms: -2 + 2 = 0
0 + 5b + b2 = 0 + 2
5b + b2 = 0 + 2

Combine like terms: 0 + 2 = 2
5b + b2 = 2

The b term is 5b.  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.
5b + 6.25 + b2 = 2 + 6.25

Reorder the terms:
6.25 + 5b + b2 = 2 + 6.25

Combine like terms: 2 + 6.25 = 8.25
6.25 + 5b + b2 = 8.25

Factor a perfect square on the left side:
(b + 2.5)(b + 2.5) = 8.25

Calculate the square root of the right side: 2.872281323

Break this problem into two subproblems by setting 
(b + 2.5) equal to 2.872281323 and -2.872281323.


Subproblem 1
b + 2.5 = 2.872281323

Simplifying
b + 2.5 = 2.872281323

Reorder the terms:
2.5 + b = 2.872281323

Solving
2.5 + b = 2.872281323

Solving for variable 'b'.

Move all terms containing b to the left, all other terms to the right.

Add '-2.5' to each side of the equation.
2.5 + -2.5 + b = 2.872281323 + -2.5

Combine like terms: 2.5 + -2.5 = 0.0
0.0 + b = 2.872281323 + -2.5
b = 2.872281323 + -2.5

Combine like terms: 2.872281323 + -2.5 = 0.372281323
b = 0.372281323

Simplifying
b = 0.372281323


Subproblem 2
b + 2.5 = -2.872281323

Simplifying
b + 2.5 = -2.872281323

Reorder the terms:
2.5 + b = -2.872281323

Solving
2.5 + b = -2.872281323

Solving for variable 'b'.

Move all terms containing b to the left, all other terms to the right.

Add '-2.5' to each side of the equation.
2.5 + -2.5 + b = -2.872281323 + -2.5

Combine like terms: 2.5 + -2.5 = 0.0
0.0 + b = -2.872281323 + -2.5
b = -2.872281323 + -2.5

Combine like terms: -2.872281323 + -2.5 = -5.372281323
b = -5.372281323

Simplifying
b = -5.372281323


Solution
The solution to the problem is based on the solutions
from the subproblems.
b = {0.372281323, -5.372281323}

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