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List argument


Hi,

I want to do these operations:

eq = m x^2 + 2(m + 1)x + m + 2
l = {}
For[i = -30, i < 30, i++, AppendTo[l, eq /. m -> i]]
Plot[l, {x, -50, 50}]

but i get this error:
l is not a machine-size real number at x = -49.99999583333334

Can someone exaplain to me what i am doing wrong here??

Thanks!

CeZaR


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