Sharp EL-W516X: Placing F1-4 functions in Normal mode expressions

[Matt Agajanian]

Hi all.

I have an EL-W516X. Let’s say

x=15
F1 is 3x^2+5x-19
F2 is 10f1(x)^2+5f1-19

is there a way to enter this in NORMAL mode:
3x^2+5x-19 STO F1
15 STO X
10(F1)^2+5(F1)-19
?

When I try to call up F1 to put in the bottom equation, F1 appears, but I lose my expression that I’m trying to create.