a) x^-2x+2=3
D=b^2-4ac = (-2)^2-4*1*2=4-8=-4
D<0 - net reshenij<br>
б) х^+10х+50=0
D=b^2-4ac = 10^2 - 4*1*50=100-200= -100
D<0 - net reshenij<br>
в) 9х^-12х+7=0
D=b^2-4ac = (-12)^2 - 4*9*7=144-252=-166
D<) - net reshenij<br>
г) х^+3=0
x^2=3 /:V
x= +/- V3