Question

f(x)=x^(3)+3x,
find each value
a. f(2+h)-f(2)
b. f(1/4)
c. f(√2)
d f(1+h)
e. f(1)
f. f(1+h)-f(1)

Answer 1

f(2+h) = substitute (2+h) in place of x in the function f(x)
and then solve

Answer 2

you need make calculi how was wrote above

but looke the f(2)=2^3 +3*2 = 8 +6 = 14

so you need calculi f(2+h) =

the same how i have calculed above f(2)

ok ?

Answer 3

thats to say f(2+h)=(2+h)^3+3*2+h right?

Answer 4

h^3+6h^2+12h+8 - 14

Answer 5

so above you need multiplie 3 with (2+h) and not just with 2

ok ?

Answer 6

h^3+6h^2+12h+8+6+3h -14
=h^3+6h^2+15h right?

Answer 7

i think yes

Answer 8

tnx and what about f(1/4)?

Answer 9

write it on the open question columne please