2b^2-b=43

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Solution for 2b^2-b=43 equation:


Simplifying
2b2 + -1b = 43

Reorder the terms:
-1b + 2b2 = 43

Solving
-1b + 2b2 = 43

Solving for variable 'b'.

Reorder the terms:
-43 + -1b + 2b2 = 43 + -43

Combine like terms: 43 + -43 = 0
-43 + -1b + 2b2 = 0

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

Divide each side by '2'.
-21.5 + -0.5b + b2 = 0

Move the constant term to the right:

Add '21.5' to each side of the equation.
-21.5 + -0.5b + 21.5 + b2 = 0 + 21.5

Reorder the terms:
-21.5 + 21.5 + -0.5b + b2 = 0 + 21.5

Combine like terms: -21.5 + 21.5 = 0.0
0.0 + -0.5b + b2 = 0 + 21.5
-0.5b + b2 = 0 + 21.5

Combine like terms: 0 + 21.5 = 21.5
-0.5b + b2 = 21.5

The b term is -0.5b.  Take half its coefficient (-0.25).
Square it (0.0625) and add it to both sides.

Add '0.0625' to each side of the equation.
-0.5b + 0.0625 + b2 = 21.5 + 0.0625

Reorder the terms:
0.0625 + -0.5b + b2 = 21.5 + 0.0625

Combine like terms: 21.5 + 0.0625 = 21.5625
0.0625 + -0.5b + b2 = 21.5625

Factor a perfect square on the left side:
(b + -0.25)(b + -0.25) = 21.5625

Calculate the square root of the right side: 4.643543905

Break this problem into two subproblems by setting 
(b + -0.25) equal to 4.643543905 and -4.643543905.

Subproblem 1

b + -0.25 = 4.643543905 Simplifying b + -0.25 = 4.643543905 Reorder the terms: -0.25 + b = 4.643543905 Solving -0.25 + b = 4.643543905 Solving for variable 'b'. Move all terms containing b to the left, all other terms to the right. Add '0.25' to each side of the equation. -0.25 + 0.25 + b = 4.643543905 + 0.25 Combine like terms: -0.25 + 0.25 = 0.00 0.00 + b = 4.643543905 + 0.25 b = 4.643543905 + 0.25 Combine like terms: 4.643543905 + 0.25 = 4.893543905 b = 4.893543905 Simplifying b = 4.893543905

Subproblem 2

b + -0.25 = -4.643543905 Simplifying b + -0.25 = -4.643543905 Reorder the terms: -0.25 + b = -4.643543905 Solving -0.25 + b = -4.643543905 Solving for variable 'b'. Move all terms containing b to the left, all other terms to the right. Add '0.25' to each side of the equation. -0.25 + 0.25 + b = -4.643543905 + 0.25 Combine like terms: -0.25 + 0.25 = 0.00 0.00 + b = -4.643543905 + 0.25 b = -4.643543905 + 0.25 Combine like terms: -4.643543905 + 0.25 = -4.393543905 b = -4.393543905 Simplifying b = -4.393543905

Solution

The solution to the problem is based on the solutions from the subproblems. b = {4.893543905, -4.393543905}

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