1) 6-x>0
x<6
2) 7x-x^2>0
x^2-7x<0
x(x-7)<0
x ∈ (0,7)
3) (x+2)/(x+5)^2 >0
x ∈ (-2 , + ∞)
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Answers & Comments
1) 6-x>0
x<6
2) 7x-x^2>0
x^2-7x<0
x(x-7)<0
x ∈ (0,7)
3) (x+2)/(x+5)^2 >0
x ∈ (-2 , + ∞)