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15x-30=360/x
We move all terms to the left:
15x-30-(360/x)=0
Domain of the equation: x)!=0We add all the numbers together, and all the variables
x!=0/1
x!=0
x∈R
15x-(+360/x)-30=0
We get rid of parentheses
15x-360/x-30=0
We multiply all the terms by the denominator
15x*x-30*x-360=0
We add all the numbers together, and all the variables
-30x+15x*x-360=0
Wy multiply elements
15x^2-30x-360=0
a = 15; b = -30; c = -360;
Δ = b2-4ac
Δ = -302-4·15·(-360)
Δ = 22500
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{22500}=150$$x_{1}=\frac{-b-\sqrt{\Delta}}{2a}=\frac{-(-30)-150}{2*15}=\frac{-120}{30} =-4 $$x_{2}=\frac{-b+\sqrt{\Delta}}{2a}=\frac{-(-30)+150}{2*15}=\frac{180}{30} =6 $
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