Hello!

I got a problem understanding this function

g(x) = -2x²+4x, x < -1

13, x = -1

2x^3+3, -1 < x

what is the

lim g(x) ?

x-> (-1)-

I found it equals to 1, since 2(-1)^3+3 = 1.

but apparently, it is incorrect. how come?

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- Feb 17th 2009, 11:56 AM3389One sided limit
Hello!

I got a problem understanding this function

g(x) = -2x²+4x, x < -1

13, x = -1

2x^3+3, -1 < x

what is the

lim g(x) ?

x-> (-1)-

I found it equals to 1, since 2(-1)^3+3 = 1.

but apparently, it is incorrect. how come? - Feb 17th 2009, 12:07 PMPlato
You are looking at the wrong side of $\displaystyle -1$.

$\displaystyle \lim _{x \to - 1^ - } \text{ means }x < - 1$