The domain for f(x) and g(x) is the set of all real numbers. let f(x) = 2x^2 + x − 3 and g(x) = x + 2. find (f • g)(x).

Composing two functions means to use the output of one as the input of the others. In fact, you can write the composition as

and then compute both functions, from inside outwards:

And maybe it's a good idea to simplify the expression: expand the square to get

sum like terms:

the 8 in 8,420 is in the thousands place so it's value is 8 thousand.

the 8 in 6,870 is in the hundreds place so it's value is 8 hundred.

divide 8000 by 800 to find the answer:

8000 / 800 = 10

the 8 in 8,420 is 10 times greater than the 8 in 6,870