9v^2-4v-9=0

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


Simplifying
9v2 + -4v + -9 = 0

Reorder the terms:
-9 + -4v + 9v2 = 0

Solving
-9 + -4v + 9v2 = 0

Solving for variable 'v'.

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

Divide each side by '9'.
-1 + -0.4444444444v + v2 = 0

Move the constant term to the right:

Add '1' to each side of the equation.
-1 + -0.4444444444v + 1 + v2 = 0 + 1

Reorder the terms:
-1 + 1 + -0.4444444444v + v2 = 0 + 1

Combine like terms: -1 + 1 = 0
0 + -0.4444444444v + v2 = 0 + 1
-0.4444444444v + v2 = 0 + 1

Combine like terms: 0 + 1 = 1
-0.4444444444v + v2 = 1

The v term is -0.4444444444v.  Take half its coefficient (-0.2222222222).
Square it (0.04938271604) and add it to both sides.

Add '0.04938271604' to each side of the equation.
-0.4444444444v + 0.04938271604 + v2 = 1 + 0.04938271604

Reorder the terms:
0.04938271604 + -0.4444444444v + v2 = 1 + 0.04938271604

Combine like terms: 1 + 0.04938271604 = 1.04938271604
0.04938271604 + -0.4444444444v + v2 = 1.04938271604

Factor a perfect square on the left side:
(v + -0.2222222222)(v + -0.2222222222) = 1.04938271604

Calculate the square root of the right side: 1.024393829

Break this problem into two subproblems by setting 
(v + -0.2222222222) equal to 1.024393829 and -1.024393829.

Subproblem 1

v + -0.2222222222 = 1.024393829 Simplifying v + -0.2222222222 = 1.024393829 Reorder the terms: -0.2222222222 + v = 1.024393829 Solving -0.2222222222 + v = 1.024393829 Solving for variable 'v'. Move all terms containing v to the left, all other terms to the right. Add '0.2222222222' to each side of the equation. -0.2222222222 + 0.2222222222 + v = 1.024393829 + 0.2222222222 Combine like terms: -0.2222222222 + 0.2222222222 = 0.0000000000 0.0000000000 + v = 1.024393829 + 0.2222222222 v = 1.024393829 + 0.2222222222 Combine like terms: 1.024393829 + 0.2222222222 = 1.2466160512 v = 1.2466160512 Simplifying v = 1.2466160512

Subproblem 2

v + -0.2222222222 = -1.024393829 Simplifying v + -0.2222222222 = -1.024393829 Reorder the terms: -0.2222222222 + v = -1.024393829 Solving -0.2222222222 + v = -1.024393829 Solving for variable 'v'. Move all terms containing v to the left, all other terms to the right. Add '0.2222222222' to each side of the equation. -0.2222222222 + 0.2222222222 + v = -1.024393829 + 0.2222222222 Combine like terms: -0.2222222222 + 0.2222222222 = 0.0000000000 0.0000000000 + v = -1.024393829 + 0.2222222222 v = -1.024393829 + 0.2222222222 Combine like terms: -1.024393829 + 0.2222222222 = -0.8021716068 v = -0.8021716068 Simplifying v = -0.8021716068

Solution

The solution to the problem is based on the solutions from the subproblems. v = {1.2466160512, -0.8021716068}

See similar equations:

| P-4/4=1 | | 3.2*0.8= | | 9v^2-4v-5=0 | | 1.50c+4a=5050 | | 4y-13=-6x+7 | | -6k-6(6k+8)=-300 | | X^2-81/x | | -9+7x^2+4x=7x | | 7x+3y=-63 | | 5n+52=-2(1-7n) | | -3t+y=-84 | | 6(3x-8)-x=-82 | | 4x^4+12x^3-41x^2-75x+100=0 | | 3/4*n=8 | | 5xy=15 | | 42+3y=-3y | | 4x+3=8x-12 | | 3=x/-15-1 | | -2-5a=-4a+6 | | y=-1/4+1/8 | | 2-3p=3p+5 | | 3(3x-2)=6 | | x^2-4x+15= | | 7n-7= | | x^1/7 | | (278/30)=14 | | .5x-1y=4 | | h=400-16t^2 | | (36/30)x=(-35/30) | | -14=-2w | | x-7/x-4 | | -5=-u/2 |

Equations solver categories