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480/x=2x
We move all terms to the left:
480/x-(2x)=0
Domain of the equation: x!=0We add all the numbers together, and all the variables
x∈R
-2x+480/x=0
We multiply all the terms by the denominator
-2x*x+480=0
Wy multiply elements
-2x^2+480=0
a = -2; b = 0; c = +480;
Δ = b2-4ac
Δ = 02-4·(-2)·480
Δ = 3840
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}$$x_{2}=\frac{-b+\sqrt{\Delta}}{2a}$
The end solution:
$\sqrt{\Delta}=\sqrt{3840}=\sqrt{256*15}=\sqrt{256}*\sqrt{15}=16\sqrt{15}$$x_{1}=\frac{-b-\sqrt{\Delta}}{2a}=\frac{-(0)-16\sqrt{15}}{2*-2}=\frac{0-16\sqrt{15}}{-4} =-\frac{16\sqrt{15}}{-4} =-\frac{4\sqrt{15}}{-1} $$x_{2}=\frac{-b+\sqrt{\Delta}}{2a}=\frac{-(0)+16\sqrt{15}}{2*-2}=\frac{0+16\sqrt{15}}{-4} =\frac{16\sqrt{15}}{-4} =\frac{4\sqrt{15}}{-1} $
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