Answer:
7 and 11.
Step-by-step explanation:
so if we say the 2 "parts" are "a" and "b" then we are left with 2 equations
a + b = 18
ab = 77
a = 18 - b
so if ab = 77
b (18 - b) also equals 77
so
-b^2 + 18b = 77
b^2 - 18b + 77 = 0
So b = 7 and 11
You could also solve this via trial and error, but this is a more analytical approach.
