Answer:
a^2 +4ab+4b^2
Step-by-step explanation:
(a+2b)^2
(a+2b)(a+2b)
FOIL
first: a*a = a^2
outer: a*2b = 2ab
inner: 2b*a = 2ab
last: 2b*2b = 4b^2
Add them together
a^2 +2ab+2ab+4b^2
Combine like terms
a^2 +4ab+4b^2
Answer:
Solution given:
(a+2b)²
we have
by using formula
(a+b)²=a²+2ab+b²
so
we get
a²+2*a*2b+(2b)²
=a²+4ab+4b²
