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3x²+25=0
3x²=-25
x²=-25/3
x=- 5/√3=-5√3/3
2)25x²+30x+9=2x-1
25x²+30x+9-2x+1=0
25x²+28x+10=0
D=784-4*25*10= -9216 (pusty zbior)
3) 16-8x+x²-(4+4x+x²)=x²+12
16-8x+x²-4-4x-x²-x²-12=0
-x²+4x=0
x(-x+4)=0
x=0 lub x=4
x=0 , bo x=4 niepasuje