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3/x-1-5/4x-4=18
We move all terms to the left:
3/x-1-5/4x-4-(18)=0
Domain of the equation: x!=0
x∈R
Domain of the equation: 4x!=0We add all the numbers together, and all the variables
x!=0/4
x!=0
x∈R
3/x-5/4x-23=0
We calculate fractions
12x/4x^2+(-5x)/4x^2-23=0
We multiply all the terms by the denominator
12x+(-5x)-23*4x^2=0
Wy multiply elements
-92x^2+12x+(-5x)=0
We get rid of parentheses
-92x^2+12x-5x=0
We add all the numbers together, and all the variables
-92x^2+7x=0
a = -92; b = 7; c = 0;
Δ = b2-4ac
Δ = 72-4·(-92)·0
Δ = 49
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{49}=7$$x_{1}=\frac{-b-\sqrt{\Delta}}{2a}=\frac{-(7)-7}{2*-92}=\frac{-14}{-184} =7/92 $$x_{2}=\frac{-b+\sqrt{\Delta}}{2a}=\frac{-(7)+7}{2*-92}=\frac{0}{-184} =0 $
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