x-3/x+4=7

Solution for x-3/x+4=7 equation:

x-3/x+4=7

We move all terms to the left:

x-3/x+4-(7)=0


Domain of the equation: x!=0

x∈R


We add all the numbers together, and all the variables

x-3/x-3=0

We multiply all the terms by the denominator


x*x-3*x-3=0

We add all the numbers together, and all the variables

-3x+x*x-3=0

Wy multiply elements

x^2-3x-3=0

a = 1; b = -3; c = -3;
Δ = b2-4ac
Δ = -32-4·1·(-3)
Δ = 21
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{-(-3)-\sqrt{21}}{2*1}=\frac{3-\sqrt{21}}{2}
$
$x_{2}=\frac{-b+\sqrt{\Delta}}{2a}=\frac{-(-3)+\sqrt{21}}{2*1}=\frac{3+\sqrt{21}}{2}
$