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5/4x+3x=10
We move all terms to the left:
5/4x+3x-(10)=0
Domain of the equation: 4x!=0We add all the numbers together, and all the variables
x!=0/4
x!=0
x∈R
3x+5/4x-10=0
We multiply all the terms by the denominator
3x*4x-10*4x+5=0
Wy multiply elements
12x^2-40x+5=0
a = 12; b = -40; c = +5;
Δ = b2-4ac
Δ = -402-4·12·5
Δ = 1360
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}$$x_{2}=\frac{-b+\sqrt{\Delta}}{2a}$
The end solution:
$\sqrt{\Delta}=\sqrt{1360}=\sqrt{16*85}=\sqrt{16}*\sqrt{85}=4\sqrt{85}$$x_{1}=\frac{-b-\sqrt{\Delta}}{2a}=\frac{-(-40)-4\sqrt{85}}{2*12}=\frac{40-4\sqrt{85}}{24} $$x_{2}=\frac{-b+\sqrt{\Delta}}{2a}=\frac{-(-40)+4\sqrt{85}}{2*12}=\frac{40+4\sqrt{85}}{24} $
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