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Yep just use that formula

Check at my question

f(x+h)=?
f(x)=?

Can you write those?

?????? it is right?????? the derivative is 4x

f(x)= 2x^2 f(x=h)= 2(x+h)^2

*f(x+h)

f(x+h)= 2x^2 f(x=h)= 2(x+h)^2

But my approach (the one with the red letters) gives 0. And I didn't do any mistake

ah yea +**

What is your problem ? You are getting correct answer 4x ?

Why 0 ? You are told x=0 ?

lim (h--->0)

that will be 0+4x .I dont see 0 anywhere

0+4x=4x

Do you see this http://screencast.com/t/YqaRwsAr5b

so option 1 will be correct

buth both options doesn't have any mathematical mistakes. Agree?

tell me which options you are speaking of

the red

I see 4 options

Which do you mean by saying both ?

Wait. Let me write the whole thing here on Open Study , 1 sec

k

Forget it I got my mistake, jeez and phew

lol Great you figured it out yourself :)