1/3x-4/9x=4

Solution for 1/3x-4/9x=4 equation:

1/3x-4/9x=4

We move all terms to the left:

1/3x-4/9x-(4)=0


Domain of the equation: 3x!=0

x!=0/3

x!=0

x∈R



Domain of the equation: 9x!=0

x!=0/9

x!=0

x∈R


We calculate fractions


9x/27x^2+(-12x)/27x^2-4=0

We multiply all the terms by the denominator


9x+(-12x)-4*27x^2=0

Wy multiply elements

-108x^2+9x+(-12x)=0

We get rid of parentheses

-108x^2+9x-12x=0

We add all the numbers together, and all the variables

-108x^2-3x=0

a = -108; b = -3; c = 0;
Δ = b2-4ac
Δ = -32-4·(-108)·0
Δ = 9
The delta value is higher than zero, so the equation has two solutions
We use following formulas to calculate our solutions:
$x_{1}=\frac{-b-\sqrt{\Delta}}{2a}$
$x_{2}=\frac{-b+\sqrt{\Delta}}{2a}$

$\sqrt{\Delta}=\sqrt{9}=3$
$x_{1}=\frac{-b-\sqrt{\Delta}}{2a}=\frac{-(-3)-3}{2*-108}=\frac{0}{-216}
=0
$
$x_{2}=\frac{-b+\sqrt{\Delta}}{2a}=\frac{-(-3)+3}{2*-108}=\frac{6}{-216}
=-1/36
$