4/(x+4)+9/x=1
4*x+9*(x+4)=1*x*(x+4)
4x+9x+36=x²+4x
13x+36=x²+4x
x²-9x-36=0 D=225 √D=15
x₁=12 x₂=-3 ∉
12+4=16.
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4/(x+4)+9/x=1
4*x+9*(x+4)=1*x*(x+4)
4x+9x+36=x²+4x
13x+36=x²+4x
x²-9x-36=0 D=225 √D=15
x₁=12 x₂=-3 ∉
12+4=16.