2b^2+6b-5=0

Simple and best practice solution for 2b^2+6b-5=0 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 2b^2+6b-5=0 equation:


Simplifying
2b2 + 6b + -5 = 0

Reorder the terms:
-5 + 6b + 2b2 = 0

Solving
-5 + 6b + 2b2 = 0

Solving for variable 'b'.

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

Divide each side by '2'.
-2.5 + 3b + b2 = 0

Move the constant term to the right:

Add '2.5' to each side of the equation.
-2.5 + 3b + 2.5 + b2 = 0 + 2.5

Reorder the terms:
-2.5 + 2.5 + 3b + b2 = 0 + 2.5

Combine like terms: -2.5 + 2.5 = 0.0
0.0 + 3b + b2 = 0 + 2.5
3b + b2 = 0 + 2.5

Combine like terms: 0 + 2.5 = 2.5
3b + b2 = 2.5

The b term is 3b.  Take half its coefficient (1.5).
Square it (2.25) and add it to both sides.

Add '2.25' to each side of the equation.
3b + 2.25 + b2 = 2.5 + 2.25

Reorder the terms:
2.25 + 3b + b2 = 2.5 + 2.25

Combine like terms: 2.5 + 2.25 = 4.75
2.25 + 3b + b2 = 4.75

Factor a perfect square on the left side:
(b + 1.5)(b + 1.5) = 4.75

Calculate the square root of the right side: 2.179449472

Break this problem into two subproblems by setting 
(b + 1.5) equal to 2.179449472 and -2.179449472.

Subproblem 1

b + 1.5 = 2.179449472 Simplifying b + 1.5 = 2.179449472 Reorder the terms: 1.5 + b = 2.179449472 Solving 1.5 + b = 2.179449472 Solving for variable 'b'. Move all terms containing b to the left, all other terms to the right. Add '-1.5' to each side of the equation. 1.5 + -1.5 + b = 2.179449472 + -1.5 Combine like terms: 1.5 + -1.5 = 0.0 0.0 + b = 2.179449472 + -1.5 b = 2.179449472 + -1.5 Combine like terms: 2.179449472 + -1.5 = 0.679449472 b = 0.679449472 Simplifying b = 0.679449472

Subproblem 2

b + 1.5 = -2.179449472 Simplifying b + 1.5 = -2.179449472 Reorder the terms: 1.5 + b = -2.179449472 Solving 1.5 + b = -2.179449472 Solving for variable 'b'. Move all terms containing b to the left, all other terms to the right. Add '-1.5' to each side of the equation. 1.5 + -1.5 + b = -2.179449472 + -1.5 Combine like terms: 1.5 + -1.5 = 0.0 0.0 + b = -2.179449472 + -1.5 b = -2.179449472 + -1.5 Combine like terms: -2.179449472 + -1.5 = -3.679449472 b = -3.679449472 Simplifying b = -3.679449472

Solution

The solution to the problem is based on the solutions from the subproblems. b = {0.679449472, -3.679449472}

See similar equations:

| 12x-7=105 | | 2x+3+5x=0 | | 8x-6=66 | | 6z=17-47 | | 40=t+4t | | 9w-11w=8 | | 3x+7=12-2x | | -25+-5X+5x+xX= | | x+6=7-x | | 4yx(x+2)= | | 3[10-4(x-3)]+2[(3x+6)-2]=2x+360 | | 7y-6=4+6y | | (x/5)+(x/8)=15-(x/20) | | 3t+4t-7=0 | | 2x(2x^2-13)=0 | | 12-2x=x-3 | | (x+5)(x-7)=(2x+4)(x-7) | | 5+3x=2x+7 | | 2x+5y=-36 | | 9x+5=6x+8 | | 16y^2=1 | | 15x-12=6x+24 | | 3x+11=8x+6 | | x^2+y^2=z^2+48 | | 3E=15 | | -7x+5+8x=2x+8-28 | | w^2-10w=24 | | 9s^3=9s | | 8960=(x+6)(x)(32) | | 2x=5x-15 | | -8m-2=-10 | | ((x)+(x+2)+(x+4))2=(x(x+2))-153 |

Equations solver categories