X-20/x+3=5

Solution for X-20/x+3=5 equation:

X-20/X+3=5

We move all terms to the left:

X-20/X+3-(5)=0


Domain of the equation: X!=0

X∈R


We add all the numbers together, and all the variables

X-20/X-2=0

We multiply all the terms by the denominator


X*X-2*X-20=0

We add all the numbers together, and all the variables

-2X+X*X-20=0

Wy multiply elements

X^2-2X-20=0

a = 1; b = -2; c = -20;
Δ = b2-4ac
Δ = -22-4·1·(-20)
Δ = 84
The delta value is higher than zero, so the equation has two solutions
We use following formulas to calculate our solutions:
$X_{1}=\frac{-b-\sqrt{\Delta}}{2a}$
$X_{2}=\frac{-b+\sqrt{\Delta}}{2a}$

The end solution:

$\sqrt{\Delta}=\sqrt{84}=\sqrt{4*21}=\sqrt{4}*\sqrt{21}=2\sqrt{21}$
$X_{1}=\frac{-b-\sqrt{\Delta}}{2a}=\frac{-(-2)-2\sqrt{21}}{2*1}=\frac{2-2\sqrt{21}}{2}
$
$X_{2}=\frac{-b+\sqrt{\Delta}}{2a}=\frac{-(-2)+2\sqrt{21}}{2*1}=\frac{2+2\sqrt{21}}{2}
$