Answer:
f(5)=
you should get math w ay it's good
to multiply-----
(2y-1)(2y+1)
2y(2y+1)-1(2y+1)
4y^2+2y-2y-1
=4y^2-1
The number is 623.
Step-by-step explanation:
= 0.25
9-8 = 1