4b^2+20b+25=20

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Solution for 4b^2+20b+25=20 equation:


Simplifying
4b2 + 20b + 25 = 20

Reorder the terms:
25 + 20b + 4b2 = 20

Solving
25 + 20b + 4b2 = 20

Solving for variable 'b'.

Reorder the terms:
25 + -20 + 20b + 4b2 = 20 + -20

Combine like terms: 25 + -20 = 5
5 + 20b + 4b2 = 20 + -20

Combine like terms: 20 + -20 = 0
5 + 20b + 4b2 = 0

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

Divide each side by '4'.
1.25 + 5b + b2 = 0

Move the constant term to the right:

Add '-1.25' to each side of the equation.
1.25 + 5b + -1.25 + b2 = 0 + -1.25

Reorder the terms:
1.25 + -1.25 + 5b + b2 = 0 + -1.25

Combine like terms: 1.25 + -1.25 = 0.00
0.00 + 5b + b2 = 0 + -1.25
5b + b2 = 0 + -1.25

Combine like terms: 0 + -1.25 = -1.25
5b + b2 = -1.25

The b term is 5b.  Take half its coefficient (2.5).
Square it (6.25) and add it to both sides.

Add '6.25' to each side of the equation.
5b + 6.25 + b2 = -1.25 + 6.25

Reorder the terms:
6.25 + 5b + b2 = -1.25 + 6.25

Combine like terms: -1.25 + 6.25 = 5
6.25 + 5b + b2 = 5

Factor a perfect square on the left side:
(b + 2.5)(b + 2.5) = 5

Calculate the square root of the right side: 2.236067978

Break this problem into two subproblems by setting 
(b + 2.5) equal to 2.236067978 and -2.236067978.

Subproblem 1

b + 2.5 = 2.236067978 Simplifying b + 2.5 = 2.236067978 Reorder the terms: 2.5 + b = 2.236067978 Solving 2.5 + b = 2.236067978 Solving for variable 'b'. Move all terms containing b to the left, all other terms to the right. Add '-2.5' to each side of the equation. 2.5 + -2.5 + b = 2.236067978 + -2.5 Combine like terms: 2.5 + -2.5 = 0.0 0.0 + b = 2.236067978 + -2.5 b = 2.236067978 + -2.5 Combine like terms: 2.236067978 + -2.5 = -0.263932022 b = -0.263932022 Simplifying b = -0.263932022

Subproblem 2

b + 2.5 = -2.236067978 Simplifying b + 2.5 = -2.236067978 Reorder the terms: 2.5 + b = -2.236067978 Solving 2.5 + b = -2.236067978 Solving for variable 'b'. Move all terms containing b to the left, all other terms to the right. Add '-2.5' to each side of the equation. 2.5 + -2.5 + b = -2.236067978 + -2.5 Combine like terms: 2.5 + -2.5 = 0.0 0.0 + b = -2.236067978 + -2.5 b = -2.236067978 + -2.5 Combine like terms: -2.236067978 + -2.5 = -4.736067978 b = -4.736067978 Simplifying b = -4.736067978

Solution

The solution to the problem is based on the solutions from the subproblems. b = {-0.263932022, -4.736067978}

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