2/3x-4x=-15

Solution for 2/3x-4x=-15 equation:

2/3x-4x=-15

We move all terms to the left:

2/3x-4x-(-15)=0


Domain of the equation: 3x!=0

x!=0/3

x!=0

x∈R


We add all the numbers together, and all the variables

-4x+2/3x+15=0

We multiply all the terms by the denominator


-4x*3x+15*3x+2=0

Wy multiply elements

-12x^2+45x+2=0

a = -12; b = 45; c = +2;
Δ = b2-4ac
Δ = 452-4·(-12)·2
Δ = 2121
The delta value is higher than zero, so the equation has two solutions
We use following formulas to calculate our solutions:
$x_{1}=\frac{-b-\sqrt{\Delta}}{2a}$
$x_{2}=\frac{-b+\sqrt{\Delta}}{2a}$

$x_{1}=\frac{-b-\sqrt{\Delta}}{2a}=\frac{-(45)-\sqrt{2121}}{2*-12}=\frac{-45-\sqrt{2121}}{-24}
$
$x_{2}=\frac{-b+\sqrt{\Delta}}{2a}=\frac{-(45)+\sqrt{2121}}{2*-12}=\frac{-45+\sqrt{2121}}{-24}
$