## anonymous 4 years ago f(x+h)-f(x) ___________ h I know the answer is 7 but I'm not sure how to get it

1. anonymous

opps i forgot to say f(x)=7x

2. EarthCitizen

yh, it's 7

3. anonymous

but how?

4. EarthCitizen

$f(x)\prime=nx ^{n-1}$

5. EarthCitizen

in this case n=1$f(x)\prime=nax ^{n-1}$

6. EarthCitizen

a=7

7. EarthCitizen

$\therefore, (1)*7x ^{1-1}=7x ^{0}=7(1)=7$