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x(x+5)<0
x=0 lub x= -5
xe(-5,0)
b)-4x^2 +x=>0
-x(4x-1)>0
x=0 lub 4x-1=0
x=0 lub x=1/4
xe<0,1/4>
c) 3x^2+7x=>0
x(3x+7)=>0
x=0 lub 3x+7=0
x=0 lub x=- 2 1/3
xe(-nieskoń, -2 1/3>U<0,nieskon)