Answer:
x^2 +20x+100
Step-by-step explanation:
(x+10)^2
(x+10) (x+10)
FOIL
first:x*x = x^2
outer: x*10
Inner 10*x
last: 10*10 =100
Add them together
x^2+10x+10x+100
x^2 +20x+100
Answer:
9,9,9,9,9
Step-by-step explanation:
Let the five unknown numbers be x
=
Simplify
Cross-cancel common factor ; 5