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2(x+16)=72/x
We move all terms to the left:
2(x+16)-(72/x)=0
Domain of the equation: x)!=0We add all the numbers together, and all the variables
x!=0/1
x!=0
x∈R
2(x+16)-(+72/x)=0
We multiply parentheses
2x-(+72/x)+32=0
We get rid of parentheses
2x-72/x+32=0
We multiply all the terms by the denominator
2x*x+32*x-72=0
We add all the numbers together, and all the variables
32x+2x*x-72=0
Wy multiply elements
2x^2+32x-72=0
a = 2; b = 32; c = -72;
Δ = b2-4ac
Δ = 322-4·2·(-72)
Δ = 1600
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{1600}=40$$x_{1}=\frac{-b-\sqrt{\Delta}}{2a}=\frac{-(32)-40}{2*2}=\frac{-72}{4} =-18 $$x_{2}=\frac{-b+\sqrt{\Delta}}{2a}=\frac{-(32)+40}{2*2}=\frac{8}{4} =2 $
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