Question 483408
Multiply: 
(a-2/5)(a+5/2) 

-----
= (a(a+(5/2))-(2/5)(a+(5/2))
-----
= a^2 + (5/2)a -(2/5)a - 1
-----
= a^2 + [(5/2)-(2/5)]a -1
-----
= a^2 + [(25-4)/10]a -1
----
= z^2 + (21/10)a -1
==========================
Cheers,
Stan H.