1st of all in this case in the question domain n codomain shud be mentioned... suppose codomain is all non-negative Reals then y=x^2 is an onto function as range is also non-negative reals..
but if co-domain is all real val(neg n pos n 0) then y=x^2 is 'into' as range is non-neg reals only.. tht is there exists values in the codomain which do not act as a mapping for ne value of x.. i.e in this case for neg values of y..no x exixts hence its into
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