Question

F(x) = x 2 + 3x - 2
F(a) =

Answer 1

\(\large\color{black}{ \displaystyle F(x) = x^2 + 3x - 2 }\)

to find \(\large\color{black}{ \displaystyle F(a) }\) plug in a instead of x.

Answer 2

I mean "a" is still a variable, so that doesn't make it any different.

Answer 3

can you plug in "a" for "x" ?

Answer 4

or want an example?

Answer 5

f(a)=x^2+3x-2?

Answer 6

no

Answer 7

you aren't just replacing the "x" with an "a" in `F(a)`.

RATHER, you replace "x" with an "x" EVERYWHERE.

Answer 8

for example, if I wanted to find F(2)

\(\large\color{black}{ \displaystyle F(2) = (2)^2 + 3(2) - 2 }\)
then I will need to simplify (if that is a possibility)
\(\large\color{black}{ \displaystyle F(2) = 4 +6 - 2 }\)
\(\large\color{black}{ \displaystyle F(2) = 8 }\)

Answer 9

I think I get it. At least a little better.

Answer 10

yes, so how (do you think) you will find F(a)

Answer 11

(again, plug in "a" instead of "x" everywhere)

Answer 12

Order of operations?

Answer 13

no, just substitute "a" for "x"

Answer 14

\(\large\color{black}{ \displaystyle F(x) = x^2 + 3x - 2 }\)

\(\large\color{black}{ \displaystyle F(a) =~~.... }\) (what will it equal ?)

Answer 15

f(a)=a^2=3a-2?

Answer 16

yes, if that second = sign was supposed to be a +

Answer 17

Thank you =)

Answer 18

you welcome !