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The denominator can't be 0
so 2x^2-5x-3 or (2x+1)(x-3)=0 when x=-1/2 or 3
(-oo, -1/2)U (-1/2, 3) U (3, oo) is domain
range is all reals
when x approaches 3 from positive side, for example, the denominator approaches a small positive.
from negative side, the denominator approaches a small negative