[" 4.If the roots of the equations "],[x...

[" 4.If the roots of the equations "],[x^(2)-(a-1)x+(a+b)=0" and "],[ax^(2)-2x+b=0" are identical,then "],[" what are the valuies of "a" and "b" ? "],[[" (1) "a=2,b=4," (2) "a=2,b=-4],[" (3) "a=1,b=(1)/(2)," (4) "a=-1,b=-(1)/(2)]]

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