5b^2-2b-14=0

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Solution for 5b^2-2b-14=0 equation:


Simplifying
5b2 + -2b + -14 = 0

Reorder the terms:
-14 + -2b + 5b2 = 0

Solving
-14 + -2b + 5b2 = 0

Solving for variable 'b'.

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

Divide each side by '5'.
-2.8 + -0.4b + b2 = 0

Move the constant term to the right:

Add '2.8' to each side of the equation.
-2.8 + -0.4b + 2.8 + b2 = 0 + 2.8

Reorder the terms:
-2.8 + 2.8 + -0.4b + b2 = 0 + 2.8

Combine like terms: -2.8 + 2.8 = 0.0
0.0 + -0.4b + b2 = 0 + 2.8
-0.4b + b2 = 0 + 2.8

Combine like terms: 0 + 2.8 = 2.8
-0.4b + b2 = 2.8

The b term is -0.4b.  Take half its coefficient (-0.2).
Square it (0.04) and add it to both sides.

Add '0.04' to each side of the equation.
-0.4b + 0.04 + b2 = 2.8 + 0.04

Reorder the terms:
0.04 + -0.4b + b2 = 2.8 + 0.04

Combine like terms: 2.8 + 0.04 = 2.84
0.04 + -0.4b + b2 = 2.84

Factor a perfect square on the left side:
(b + -0.2)(b + -0.2) = 2.84

Calculate the square root of the right side: 1.685229955

Break this problem into two subproblems by setting 
(b + -0.2) equal to 1.685229955 and -1.685229955.

Subproblem 1

b + -0.2 = 1.685229955 Simplifying b + -0.2 = 1.685229955 Reorder the terms: -0.2 + b = 1.685229955 Solving -0.2 + b = 1.685229955 Solving for variable 'b'. Move all terms containing b to the left, all other terms to the right. Add '0.2' to each side of the equation. -0.2 + 0.2 + b = 1.685229955 + 0.2 Combine like terms: -0.2 + 0.2 = 0.0 0.0 + b = 1.685229955 + 0.2 b = 1.685229955 + 0.2 Combine like terms: 1.685229955 + 0.2 = 1.885229955 b = 1.885229955 Simplifying b = 1.885229955

Subproblem 2

b + -0.2 = -1.685229955 Simplifying b + -0.2 = -1.685229955 Reorder the terms: -0.2 + b = -1.685229955 Solving -0.2 + b = -1.685229955 Solving for variable 'b'. Move all terms containing b to the left, all other terms to the right. Add '0.2' to each side of the equation. -0.2 + 0.2 + b = -1.685229955 + 0.2 Combine like terms: -0.2 + 0.2 = 0.0 0.0 + b = -1.685229955 + 0.2 b = -1.685229955 + 0.2 Combine like terms: -1.685229955 + 0.2 = -1.485229955 b = -1.485229955 Simplifying b = -1.485229955

Solution

The solution to the problem is based on the solutions from the subproblems. b = {1.885229955, -1.485229955}

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