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(9/m+4)+4=m
We move all terms to the left:
(9/m+4)+4-(m)=0
Domain of the equation: m+4)!=0We add all the numbers together, and all the variables
m∈R
-1m+(9/m+4)+4=0
We get rid of parentheses
-1m+9/m+4+4=0
We multiply all the terms by the denominator
-1m*m+4*m+4*m+9=0
We add all the numbers together, and all the variables
8m-1m*m+9=0
Wy multiply elements
-1m^2+8m+9=0
a = -1; b = 8; c = +9;
Δ = b2-4ac
Δ = 82-4·(-1)·9
Δ = 100
The delta value is higher than zero, so the equation has two solutions
We use following formulas to calculate our solutions:$m_{1}=\frac{-b-\sqrt{\Delta}}{2a}$$m_{2}=\frac{-b+\sqrt{\Delta}}{2a}$$\sqrt{\Delta}=\sqrt{100}=10$$m_{1}=\frac{-b-\sqrt{\Delta}}{2a}=\frac{-(8)-10}{2*-1}=\frac{-18}{-2} =+9 $$m_{2}=\frac{-b+\sqrt{\Delta}}{2a}=\frac{-(8)+10}{2*-1}=\frac{2}{-2} =-1 $
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