2*b*b+b=20

Simple and best practice solution for 2*b*b+b=20 equation. Check how easy it is, and learn it for the future. Our solution is simple, and easy to understand, so don`t hesitate to use it as a solution of your homework.

If it's not what You are looking for type in the equation solver your own equation and let us solve it.

Solution for 2*b*b+b=20 equation:


Simplifying
2b * b + b = 20

Multiply b * b
2b2 + b = 20

Reorder the terms:
b + 2b2 = 20

Solving
b + 2b2 = 20

Solving for variable 'b'.

Reorder the terms:
-20 + b + 2b2 = 20 + -20

Combine like terms: 20 + -20 = 0
-20 + b + 2b2 = 0

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

Divide each side by '2'.
-10 + 0.5b + b2 = 0

Move the constant term to the right:

Add '10' to each side of the equation.
-10 + 0.5b + 10 + b2 = 0 + 10

Reorder the terms:
-10 + 10 + 0.5b + b2 = 0 + 10

Combine like terms: -10 + 10 = 0
0 + 0.5b + b2 = 0 + 10
0.5b + b2 = 0 + 10

Combine like terms: 0 + 10 = 10
0.5b + b2 = 10

The b term is b.  Take half its coefficient (0.5).
Square it (0.25) and add it to both sides.

Add '0.25' to each side of the equation.
0.5b + 0.25 + b2 = 10 + 0.25

Reorder the terms:
0.25 + 0.5b + b2 = 10 + 0.25

Combine like terms: 10 + 0.25 = 10.25
0.25 + 0.5b + b2 = 10.25

Factor a perfect square on the left side:
(b + 0.5)(b + 0.5) = 10.25

Calculate the square root of the right side: 3.201562119

Break this problem into two subproblems by setting 
(b + 0.5) equal to 3.201562119 and -3.201562119.

Subproblem 1

b + 0.5 = 3.201562119 Simplifying b + 0.5 = 3.201562119 Reorder the terms: 0.5 + b = 3.201562119 Solving 0.5 + b = 3.201562119 Solving for variable 'b'. Move all terms containing b to the left, all other terms to the right. Add '-0.5' to each side of the equation. 0.5 + -0.5 + b = 3.201562119 + -0.5 Combine like terms: 0.5 + -0.5 = 0.0 0.0 + b = 3.201562119 + -0.5 b = 3.201562119 + -0.5 Combine like terms: 3.201562119 + -0.5 = 2.701562119 b = 2.701562119 Simplifying b = 2.701562119

Subproblem 2

b + 0.5 = -3.201562119 Simplifying b + 0.5 = -3.201562119 Reorder the terms: 0.5 + b = -3.201562119 Solving 0.5 + b = -3.201562119 Solving for variable 'b'. Move all terms containing b to the left, all other terms to the right. Add '-0.5' to each side of the equation. 0.5 + -0.5 + b = -3.201562119 + -0.5 Combine like terms: 0.5 + -0.5 = 0.0 0.0 + b = -3.201562119 + -0.5 b = -3.201562119 + -0.5 Combine like terms: -3.201562119 + -0.5 = -3.701562119 b = -3.701562119 Simplifying b = -3.701562119

Solution

The solution to the problem is based on the solutions from the subproblems. b = {2.701562119, -3.701562119}

See similar equations:

| x+(x*0.3)=5000 | | x-7+3x-14=2x+15 | | Y=2/3(21)-4 | | 2x-x+4=18 | | 5x+24+8x-3=13x+2 | | 4b+5b-5=22 | | p^2-8p=-12 | | 7(x-4)+8=22 | | 83+517=t | | 83-517=t | | A+20-A=7.75 | | 83=517 | | 15p^2+80+80=0 | | y=x^2+21x+36 | | lg(2x+-7)=0 | | 5x-1.5-6+3= | | 6x=-8x+48 | | 513/190512 | | 27=(3+y)(3+y) | | x-15x=300 | | -5x+17=3x+1 | | N^2+n=100 | | 43=-3(5x-4) | | (z^(1/3))/(z^(-3/2)z^(1/2)) | | 12+3(2b-4)= | | 3x+12+8x=112+x | | 10+5x=2y | | 5x^4-12x^2+8=0 | | (Y^3*z^1/2)^-5/2 | | 0.5x+8.7=12.25 | | =(x-0.75)(x-0.75)(x+2.05) | | 2s-1=15 |

Equations solver categories