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x^2 +4x -5 >=0 | +9 (dodaje 9 aby powstał wzor soroconego mnozenia przydatna metoda jezli nie miałas jeszcze delty :p )
x^2+4x+4 <+ 9
(x+2)^2=>9
x+2=>3 lub x+2<=-3
x=>1 lub x<=-5
2.
x^2 +4x -5 <0 |+9
(x+2)^2 <9
-9<x+2<3
-5<x<1
3.
-x^2+3x >=0 | *-1
x^2-3x <= 0 | +2,25
(x+1,5)^2 <= 2,25
-1,5<=x+1,5<=1,5
-3<=x<=0