2b^2+b-25=0

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Solution for 2b^2+b-25=0 equation:


Simplifying
2b2 + b + -25 = 0

Reorder the terms:
-25 + b + 2b2 = 0

Solving
-25 + b + 2b2 = 0

Solving for variable 'b'.

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

Divide each side by '2'.
-12.5 + 0.5b + b2 = 0

Move the constant term to the right:

Add '12.5' to each side of the equation.
-12.5 + 0.5b + 12.5 + b2 = 0 + 12.5

Reorder the terms:
-12.5 + 12.5 + 0.5b + b2 = 0 + 12.5

Combine like terms: -12.5 + 12.5 = 0.0
0.0 + 0.5b + b2 = 0 + 12.5
0.5b + b2 = 0 + 12.5

Combine like terms: 0 + 12.5 = 12.5
0.5b + b2 = 12.5

The b term is b.  Take half its coefficient (0.5).
Square it (0.25) and add it to both sides.

Add '0.25' to each side of the equation.
0.5b + 0.25 + b2 = 12.5 + 0.25

Reorder the terms:
0.25 + 0.5b + b2 = 12.5 + 0.25

Combine like terms: 12.5 + 0.25 = 12.75
0.25 + 0.5b + b2 = 12.75

Factor a perfect square on the left side:
(b + 0.5)(b + 0.5) = 12.75

Calculate the square root of the right side: 3.570714214

Break this problem into two subproblems by setting 
(b + 0.5) equal to 3.570714214 and -3.570714214.

Subproblem 1

b + 0.5 = 3.570714214 Simplifying b + 0.5 = 3.570714214 Reorder the terms: 0.5 + b = 3.570714214 Solving 0.5 + b = 3.570714214 Solving for variable 'b'. Move all terms containing b to the left, all other terms to the right. Add '-0.5' to each side of the equation. 0.5 + -0.5 + b = 3.570714214 + -0.5 Combine like terms: 0.5 + -0.5 = 0.0 0.0 + b = 3.570714214 + -0.5 b = 3.570714214 + -0.5 Combine like terms: 3.570714214 + -0.5 = 3.070714214 b = 3.070714214 Simplifying b = 3.070714214

Subproblem 2

b + 0.5 = -3.570714214 Simplifying b + 0.5 = -3.570714214 Reorder the terms: 0.5 + b = -3.570714214 Solving 0.5 + b = -3.570714214 Solving for variable 'b'. Move all terms containing b to the left, all other terms to the right. Add '-0.5' to each side of the equation. 0.5 + -0.5 + b = -3.570714214 + -0.5 Combine like terms: 0.5 + -0.5 = 0.0 0.0 + b = -3.570714214 + -0.5 b = -3.570714214 + -0.5 Combine like terms: -3.570714214 + -0.5 = -4.070714214 b = -4.070714214 Simplifying b = -4.070714214

Solution

The solution to the problem is based on the solutions from the subproblems. b = {3.070714214, -4.070714214}

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