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x+5/4x+3/4x=2400
We move all terms to the left:
x+5/4x+3/4x-(2400)=0
Domain of the equation: 4x!=0We multiply all the terms by the denominator
x!=0/4
x!=0
x∈R
x*4x-2400*4x+5+3=0
We add all the numbers together, and all the variables
x*4x-2400*4x+8=0
Wy multiply elements
4x^2-9600x+8=0
a = 4; b = -9600; c = +8;
Δ = b2-4ac
Δ = -96002-4·4·8
Δ = 92159872
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}$$x_{2}=\frac{-b+\sqrt{\Delta}}{2a}$
The end solution:
$\sqrt{\Delta}=\sqrt{92159872}=\sqrt{64*1439998}=\sqrt{64}*\sqrt{1439998}=8\sqrt{1439998}$$x_{1}=\frac{-b-\sqrt{\Delta}}{2a}=\frac{-(-9600)-8\sqrt{1439998}}{2*4}=\frac{9600-8\sqrt{1439998}}{8} $$x_{2}=\frac{-b+\sqrt{\Delta}}{2a}=\frac{-(-9600)+8\sqrt{1439998}}{2*4}=\frac{9600+8\sqrt{1439998}}{8} $
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