4b^2-12b-9=0

Simple and best practice solution for 4b^2-12b-9=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 4b^2-12b-9=0 equation:


Simplifying
4b2 + -12b + -9 = 0

Reorder the terms:
-9 + -12b + 4b2 = 0

Solving
-9 + -12b + 4b2 = 0

Solving for variable 'b'.

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

Divide each side by '4'.
-2.25 + -3b + b2 = 0

Move the constant term to the right:

Add '2.25' to each side of the equation.
-2.25 + -3b + 2.25 + b2 = 0 + 2.25

Reorder the terms:
-2.25 + 2.25 + -3b + b2 = 0 + 2.25

Combine like terms: -2.25 + 2.25 = 0.00
0.00 + -3b + b2 = 0 + 2.25
-3b + b2 = 0 + 2.25

Combine like terms: 0 + 2.25 = 2.25
-3b + b2 = 2.25

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 = 2.25 + 2.25

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

Combine like terms: 2.25 + 2.25 = 4.5
2.25 + -3b + b2 = 4.5

Factor a perfect square on the left side:
(b + -1.5)(b + -1.5) = 4.5

Calculate the square root of the right side: 2.121320344

Break this problem into two subproblems by setting 
(b + -1.5) equal to 2.121320344 and -2.121320344.

Subproblem 1

b + -1.5 = 2.121320344 Simplifying b + -1.5 = 2.121320344 Reorder the terms: -1.5 + b = 2.121320344 Solving -1.5 + b = 2.121320344 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 = 2.121320344 + 1.5 Combine like terms: -1.5 + 1.5 = 0.0 0.0 + b = 2.121320344 + 1.5 b = 2.121320344 + 1.5 Combine like terms: 2.121320344 + 1.5 = 3.621320344 b = 3.621320344 Simplifying b = 3.621320344

Subproblem 2

b + -1.5 = -2.121320344 Simplifying b + -1.5 = -2.121320344 Reorder the terms: -1.5 + b = -2.121320344 Solving -1.5 + b = -2.121320344 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 = -2.121320344 + 1.5 Combine like terms: -1.5 + 1.5 = 0.0 0.0 + b = -2.121320344 + 1.5 b = -2.121320344 + 1.5 Combine like terms: -2.121320344 + 1.5 = -0.621320344 b = -0.621320344 Simplifying b = -0.621320344

Solution

The solution to the problem is based on the solutions from the subproblems. b = {3.621320344, -0.621320344}

See similar equations:

| 6x+8=-15+x | | 4+25x=15x+22 | | 2y-3=41 | | 8p^2+48p=0 | | 6x-4=8x+7 | | 4a-2b+18=0 | | 240x=y | | 9(6p+9)= | | lgx^3=6 | | 1/12-1/9= | | x=Y/240 | | 0.5+-0.5t-t=8 | | D^3-3d^2+4d-2=0 | | 3p+pq-4p=r | | 5/14-1/12x-1/7-1/9x= | | 20=4x/9-9 | | 5-4x+9=2x+10 | | 16/-12 | | 16/-12= | | 10x+12=6x+92 | | 4/2x/4=3 | | 6m+3t=3 | | 9x^2-2(1-3k)x-1+k^2=0 | | 10x-3x2/15= | | 12x^2-26x+10=-26x+34 | | 2(3x+-4)=20+2x | | f(x)=x^2+bx+7 | | lnx=5644 | | A=5k+3*2k+1 | | 1.20x-1.40=.80x | | 1.20-1.40=.80x | | y=(x+7)lnx^6 |

Equations solver categories