kendal12

## Main Question or Discussion Point

I just started calculus and we are doing limits. I was doing fine on my hmwrk until i came to this problem:

Find lim f(x+∆x) – f(x)/ ∆x

∆x→0

f(x)= x^2 – 4x

I have no idea what the delta means... I know in chem it means "a change in", but I don't know what to do with it here. My book doesn't explain it either. Please help! Thanks

Find lim f(x+∆x) – f(x)/ ∆x

∆x→0

f(x)= x^2 – 4x

I have no idea what the delta means... I know in chem it means "a change in", but I don't know what to do with it here. My book doesn't explain it either. Please help! Thanks