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3x=1/2x*15.
We move all terms to the left:
3x-(1/2x*15.)=0
Domain of the equation: 2x*15.)!=0We add all the numbers together, and all the variables
x!=0/1
x!=0
x∈R
3x-(+1/2x*15.)=0
We get rid of parentheses
3x-1/2x*15.=0
We multiply all the terms by the denominator
3x*2x*15.-1=0
Wy multiply elements
90x^2*1-1=0
Wy multiply elements
90x^2-1=0
a = 90; b = 0; c = -1;
Δ = b2-4ac
Δ = 02-4·90·(-1)
Δ = 360
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}$$x_{2}=\frac{-b+\sqrt{\Delta}}{2a}$
The end solution:
$\sqrt{\Delta}=\sqrt{360}=\sqrt{36*10}=\sqrt{36}*\sqrt{10}=6\sqrt{10}$$x_{1}=\frac{-b-\sqrt{\Delta}}{2a}=\frac{-(0)-6\sqrt{10}}{2*90}=\frac{0-6\sqrt{10}}{180} =-\frac{6\sqrt{10}}{180} =-\frac{\sqrt{10}}{30} $$x_{2}=\frac{-b+\sqrt{\Delta}}{2a}=\frac{-(0)+6\sqrt{10}}{2*90}=\frac{0+6\sqrt{10}}{180} =\frac{6\sqrt{10}}{180} =\frac{\sqrt{10}}{30} $
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