-b^2+4b=-10

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Solution for -b^2+4b=-10 equation:


Simplifying
-1b2 + 4b = -10

Reorder the terms:
4b + -1b2 = -10

Solving
4b + -1b2 = -10

Solving for variable 'b'.

Reorder the terms:
10 + 4b + -1b2 = -10 + 10

Combine like terms: -10 + 10 = 0
10 + 4b + -1b2 = 0

Begin completing the square.  Divide all terms by
-1 the coefficient of the squared term: 

Divide each side by '-1'.
-10 + -4b + b2 = 0

Move the constant term to the right:

Add '10' to each side of the equation.
-10 + -4b + 10 + b2 = 0 + 10

Reorder the terms:
-10 + 10 + -4b + b2 = 0 + 10

Combine like terms: -10 + 10 = 0
0 + -4b + b2 = 0 + 10
-4b + b2 = 0 + 10

Combine like terms: 0 + 10 = 10
-4b + b2 = 10

The b term is -4b.  Take half its coefficient (-2).
Square it (4) and add it to both sides.

Add '4' to each side of the equation.
-4b + 4 + b2 = 10 + 4

Reorder the terms:
4 + -4b + b2 = 10 + 4

Combine like terms: 10 + 4 = 14
4 + -4b + b2 = 14

Factor a perfect square on the left side:
(b + -2)(b + -2) = 14

Calculate the square root of the right side: 3.741657387

Break this problem into two subproblems by setting 
(b + -2) equal to 3.741657387 and -3.741657387.

Subproblem 1

b + -2 = 3.741657387 Simplifying b + -2 = 3.741657387 Reorder the terms: -2 + b = 3.741657387 Solving -2 + b = 3.741657387 Solving for variable 'b'. Move all terms containing b to the left, all other terms to the right. Add '2' to each side of the equation. -2 + 2 + b = 3.741657387 + 2 Combine like terms: -2 + 2 = 0 0 + b = 3.741657387 + 2 b = 3.741657387 + 2 Combine like terms: 3.741657387 + 2 = 5.741657387 b = 5.741657387 Simplifying b = 5.741657387

Subproblem 2

b + -2 = -3.741657387 Simplifying b + -2 = -3.741657387 Reorder the terms: -2 + b = -3.741657387 Solving -2 + b = -3.741657387 Solving for variable 'b'. Move all terms containing b to the left, all other terms to the right. Add '2' to each side of the equation. -2 + 2 + b = -3.741657387 + 2 Combine like terms: -2 + 2 = 0 0 + b = -3.741657387 + 2 b = -3.741657387 + 2 Combine like terms: -3.741657387 + 2 = -1.741657387 b = -1.741657387 Simplifying b = -1.741657387

Solution

The solution to the problem is based on the solutions from the subproblems. b = {5.741657387, -1.741657387}

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