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3/2x+x+2x+3x=90
We move all terms to the left:
3/2x+x+2x+3x-(90)=0
Domain of the equation: 2x!=0We add all the numbers together, and all the variables
x!=0/2
x!=0
x∈R
6x+3/2x-90=0
We multiply all the terms by the denominator
6x*2x-90*2x+3=0
Wy multiply elements
12x^2-180x+3=0
a = 12; b = -180; c = +3;
Δ = b2-4ac
Δ = -1802-4·12·3
Δ = 32256
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}$$x_{2}=\frac{-b+\sqrt{\Delta}}{2a}$
The end solution:
$\sqrt{\Delta}=\sqrt{32256}=\sqrt{2304*14}=\sqrt{2304}*\sqrt{14}=48\sqrt{14}$$x_{1}=\frac{-b-\sqrt{\Delta}}{2a}=\frac{-(-180)-48\sqrt{14}}{2*12}=\frac{180-48\sqrt{14}}{24} $$x_{2}=\frac{-b+\sqrt{\Delta}}{2a}=\frac{-(-180)+48\sqrt{14}}{2*12}=\frac{180+48\sqrt{14}}{24} $
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