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(2x+17)/(x+1)=x+5
We move all terms to the left:
(2x+17)/(x+1)-(x+5)=0
Domain of the equation: (x+1)!=0We get rid of parentheses
We move all terms containing x to the left, all other terms to the right
x!=-1
x∈R
(2x+17)/(x+1)-x-5=0
We multiply all the terms by the denominator
(2x+17)-x*(x+1)-5*(x+1)=0
We multiply parentheses
-x^2+(2x+17)-x-5x-5=0
We get rid of parentheses
-x^2+2x-x-5x+17-5=0
We add all the numbers together, and all the variables
-1x^2-4x+12=0
a = -1; b = -4; c = +12;
Δ = b2-4ac
Δ = -42-4·(-1)·12
Δ = 64
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{64}=8$$x_{1}=\frac{-b-\sqrt{\Delta}}{2a}=\frac{-(-4)-8}{2*-1}=\frac{-4}{-2} =+2 $$x_{2}=\frac{-b+\sqrt{\Delta}}{2a}=\frac{-(-4)+8}{2*-1}=\frac{12}{-2} =-6 $
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