0=.5b^2+2.5b-324

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Solution for 0=.5b^2+2.5b-324 equation:


Simplifying
0 = 0.5b2 + 2.5b + -324

Reorder the terms:
0 = -324 + 2.5b + 0.5b2

Solving
0 = -324 + 2.5b + 0.5b2

Solving for variable 'b'.

Combine like terms: 0 + 324 = 324
324 + -2.5b + -0.5b2 = -324 + 2.5b + 0.5b2 + 324 + -2.5b + -0.5b2

Reorder the terms:
324 + -2.5b + -0.5b2 = -324 + 324 + 2.5b + -2.5b + 0.5b2 + -0.5b2

Combine like terms: -324 + 324 = 0
324 + -2.5b + -0.5b2 = 0 + 2.5b + -2.5b + 0.5b2 + -0.5b2
324 + -2.5b + -0.5b2 = 2.5b + -2.5b + 0.5b2 + -0.5b2

Combine like terms: 2.5b + -2.5b = 0.0
324 + -2.5b + -0.5b2 = 0.0 + 0.5b2 + -0.5b2
324 + -2.5b + -0.5b2 = 0.5b2 + -0.5b2

Combine like terms: 0.5b2 + -0.5b2 = 0.0
324 + -2.5b + -0.5b2 = 0.0

Begin completing the square.  Divide all terms by
-0.5 the coefficient of the squared term: 

Divide each side by '-0.5'.
-648 + 5b + b2 = 0

Move the constant term to the right:

Add '648' to each side of the equation.
-648 + 5b + 648 + b2 = 0 + 648

Reorder the terms:
-648 + 648 + 5b + b2 = 0 + 648

Combine like terms: -648 + 648 = 0
0 + 5b + b2 = 0 + 648
5b + b2 = 0 + 648

Combine like terms: 0 + 648 = 648
5b + b2 = 648

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 = 648 + 6.25

Reorder the terms:
6.25 + 5b + b2 = 648 + 6.25

Combine like terms: 648 + 6.25 = 654.25
6.25 + 5b + b2 = 654.25

Factor a perfect square on the left side:
(b + 2.5)(b + 2.5) = 654.25

Calculate the square root of the right side: 25.578311125

Break this problem into two subproblems by setting 
(b + 2.5) equal to 25.578311125 and -25.578311125.

Subproblem 1

b + 2.5 = 25.578311125 Simplifying b + 2.5 = 25.578311125 Reorder the terms: 2.5 + b = 25.578311125 Solving 2.5 + b = 25.578311125 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 = 25.578311125 + -2.5 Combine like terms: 2.5 + -2.5 = 0.0 0.0 + b = 25.578311125 + -2.5 b = 25.578311125 + -2.5 Combine like terms: 25.578311125 + -2.5 = 23.078311125 b = 23.078311125 Simplifying b = 23.078311125

Subproblem 2

b + 2.5 = -25.578311125 Simplifying b + 2.5 = -25.578311125 Reorder the terms: 2.5 + b = -25.578311125 Solving 2.5 + b = -25.578311125 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 = -25.578311125 + -2.5 Combine like terms: 2.5 + -2.5 = 0.0 0.0 + b = -25.578311125 + -2.5 b = -25.578311125 + -2.5 Combine like terms: -25.578311125 + -2.5 = -28.078311125 b = -28.078311125 Simplifying b = -28.078311125

Solution

The solution to the problem is based on the solutions from the subproblems. b = {23.078311125, -28.078311125}

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