b^2-8b+4=0

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Solution for b^2-8b+4=0 equation:


Simplifying
b2 + -8b + 4 = 0

Reorder the terms:
4 + -8b + b2 = 0

Solving
4 + -8b + b2 = 0

Solving for variable 'b'.

Begin completing the square.

Move the constant term to the right:

Add '-4' to each side of the equation.
4 + -8b + -4 + b2 = 0 + -4

Reorder the terms:
4 + -4 + -8b + b2 = 0 + -4

Combine like terms: 4 + -4 = 0
0 + -8b + b2 = 0 + -4
-8b + b2 = 0 + -4

Combine like terms: 0 + -4 = -4
-8b + b2 = -4

The b term is -8b.  Take half its coefficient (-4).
Square it (16) and add it to both sides.

Add '16' to each side of the equation.
-8b + 16 + b2 = -4 + 16

Reorder the terms:
16 + -8b + b2 = -4 + 16

Combine like terms: -4 + 16 = 12
16 + -8b + b2 = 12

Factor a perfect square on the left side:
(b + -4)(b + -4) = 12

Calculate the square root of the right side: 3.464101615

Break this problem into two subproblems by setting 
(b + -4) equal to 3.464101615 and -3.464101615.

Subproblem 1

b + -4 = 3.464101615 Simplifying b + -4 = 3.464101615 Reorder the terms: -4 + b = 3.464101615 Solving -4 + b = 3.464101615 Solving for variable 'b'. Move all terms containing b to the left, all other terms to the right. Add '4' to each side of the equation. -4 + 4 + b = 3.464101615 + 4 Combine like terms: -4 + 4 = 0 0 + b = 3.464101615 + 4 b = 3.464101615 + 4 Combine like terms: 3.464101615 + 4 = 7.464101615 b = 7.464101615 Simplifying b = 7.464101615

Subproblem 2

b + -4 = -3.464101615 Simplifying b + -4 = -3.464101615 Reorder the terms: -4 + b = -3.464101615 Solving -4 + b = -3.464101615 Solving for variable 'b'. Move all terms containing b to the left, all other terms to the right. Add '4' to each side of the equation. -4 + 4 + b = -3.464101615 + 4 Combine like terms: -4 + 4 = 0 0 + b = -3.464101615 + 4 b = -3.464101615 + 4 Combine like terms: -3.464101615 + 4 = 0.535898385 b = 0.535898385 Simplifying b = 0.535898385

Solution

The solution to the problem is based on the solutions from the subproblems. b = {7.464101615, 0.535898385}

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