-b^2-7b+10=0

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Solution for -b^2-7b+10=0 equation:


Simplifying
-1b2 + -7b + 10 = 0

Reorder the terms:
10 + -7b + -1b2 = 0

Solving
10 + -7b + -1b2 = 0

Solving for variable 'b'.

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

Divide each side by '-1'.
-10 + 7b + b2 = 0

Move the constant term to the right:

Add '10' to each side of the equation.
-10 + 7b + 10 + b2 = 0 + 10

Reorder the terms:
-10 + 10 + 7b + b2 = 0 + 10

Combine like terms: -10 + 10 = 0
0 + 7b + b2 = 0 + 10
7b + b2 = 0 + 10

Combine like terms: 0 + 10 = 10
7b + b2 = 10

The b term is 7b.  Take half its coefficient (3.5).
Square it (12.25) and add it to both sides.

Add '12.25' to each side of the equation.
7b + 12.25 + b2 = 10 + 12.25

Reorder the terms:
12.25 + 7b + b2 = 10 + 12.25

Combine like terms: 10 + 12.25 = 22.25
12.25 + 7b + b2 = 22.25

Factor a perfect square on the left side:
(b + 3.5)(b + 3.5) = 22.25

Calculate the square root of the right side: 4.716990566

Break this problem into two subproblems by setting 
(b + 3.5) equal to 4.716990566 and -4.716990566.

Subproblem 1

b + 3.5 = 4.716990566 Simplifying b + 3.5 = 4.716990566 Reorder the terms: 3.5 + b = 4.716990566 Solving 3.5 + b = 4.716990566 Solving for variable 'b'. Move all terms containing b to the left, all other terms to the right. Add '-3.5' to each side of the equation. 3.5 + -3.5 + b = 4.716990566 + -3.5 Combine like terms: 3.5 + -3.5 = 0.0 0.0 + b = 4.716990566 + -3.5 b = 4.716990566 + -3.5 Combine like terms: 4.716990566 + -3.5 = 1.216990566 b = 1.216990566 Simplifying b = 1.216990566

Subproblem 2

b + 3.5 = -4.716990566 Simplifying b + 3.5 = -4.716990566 Reorder the terms: 3.5 + b = -4.716990566 Solving 3.5 + b = -4.716990566 Solving for variable 'b'. Move all terms containing b to the left, all other terms to the right. Add '-3.5' to each side of the equation. 3.5 + -3.5 + b = -4.716990566 + -3.5 Combine like terms: 3.5 + -3.5 = 0.0 0.0 + b = -4.716990566 + -3.5 b = -4.716990566 + -3.5 Combine like terms: -4.716990566 + -3.5 = -8.216990566 b = -8.216990566 Simplifying b = -8.216990566

Solution

The solution to the problem is based on the solutions from the subproblems. b = {1.216990566, -8.216990566}

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