Math for machinlearning _ quiz 1 from week 1

[hossin_rezazadeh]

hI friends !
so i just delivered my quiz from week 1 of math for machinlearning and i passed it but one of the questions was this and i think my answer was right but the site says otherwise , so what are you think?

[bruno_ramos_martins]

Hello @Rossin,
I think the text formatting confused you; he wants to know the rate of change of

f(x)=x²+3

at x = 6.

I hope this helps.

[paulinpaloalto]

Also note that if f(x) = x^2 +3, then f'(x) \neq 2x + 3, right?

[Girijesh]

Dear @hossin_rezazadeh,

Your answer is wrong.
differentiate f(x) i.e.

f’(x) = 2x

now put the value of x in the above equation and get the rate of change.

[hossin_rezazadeh]

Thanks friend!

[hossin_rezazadeh]

Thanks friend!
I didn’t consider that.

[hossin_rezazadeh]

Thanks friend!
But i think there should be t involved your answer.