4b^2+8b+7=14

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Solution for 4b^2+8b+7=14 equation:


Simplifying
4b2 + 8b + 7 = 14

Reorder the terms:
7 + 8b + 4b2 = 14

Solving
7 + 8b + 4b2 = 14

Solving for variable 'b'.

Reorder the terms:
7 + -14 + 8b + 4b2 = 14 + -14

Combine like terms: 7 + -14 = -7
-7 + 8b + 4b2 = 14 + -14

Combine like terms: 14 + -14 = 0
-7 + 8b + 4b2 = 0

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

Divide each side by '4'.
-1.75 + 2b + b2 = 0

Move the constant term to the right:

Add '1.75' to each side of the equation.
-1.75 + 2b + 1.75 + b2 = 0 + 1.75

Reorder the terms:
-1.75 + 1.75 + 2b + b2 = 0 + 1.75

Combine like terms: -1.75 + 1.75 = 0.00
0.00 + 2b + b2 = 0 + 1.75
2b + b2 = 0 + 1.75

Combine like terms: 0 + 1.75 = 1.75
2b + b2 = 1.75

The b term is 2b.  Take half its coefficient (1).
Square it (1) and add it to both sides.

Add '1' to each side of the equation.
2b + 1 + b2 = 1.75 + 1

Reorder the terms:
1 + 2b + b2 = 1.75 + 1

Combine like terms: 1.75 + 1 = 2.75
1 + 2b + b2 = 2.75

Factor a perfect square on the left side:
(b + 1)(b + 1) = 2.75

Calculate the square root of the right side: 1.658312395

Break this problem into two subproblems by setting 
(b + 1) equal to 1.658312395 and -1.658312395.

Subproblem 1

b + 1 = 1.658312395 Simplifying b + 1 = 1.658312395 Reorder the terms: 1 + b = 1.658312395 Solving 1 + b = 1.658312395 Solving for variable 'b'. Move all terms containing b to the left, all other terms to the right. Add '-1' to each side of the equation. 1 + -1 + b = 1.658312395 + -1 Combine like terms: 1 + -1 = 0 0 + b = 1.658312395 + -1 b = 1.658312395 + -1 Combine like terms: 1.658312395 + -1 = 0.658312395 b = 0.658312395 Simplifying b = 0.658312395

Subproblem 2

b + 1 = -1.658312395 Simplifying b + 1 = -1.658312395 Reorder the terms: 1 + b = -1.658312395 Solving 1 + b = -1.658312395 Solving for variable 'b'. Move all terms containing b to the left, all other terms to the right. Add '-1' to each side of the equation. 1 + -1 + b = -1.658312395 + -1 Combine like terms: 1 + -1 = 0 0 + b = -1.658312395 + -1 b = -1.658312395 + -1 Combine like terms: -1.658312395 + -1 = -2.658312395 b = -2.658312395 Simplifying b = -2.658312395

Solution

The solution to the problem is based on the solutions from the subproblems. b = {0.658312395, -2.658312395}

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