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?

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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.

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

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.

Thanks friend!

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Thanks friend!

I didn’t consider that.

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Thanks friend!

But i think there should be t involved your answer.

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