Answer: p²+2pq+q²
Explanation:
squaring a binomial works like this:
(p+q)² = (p+q)(p+q)
try the FOIL method: multiply the first, outside, inside, and last numbers/variables to distribute properly
F: (p)(p) = p²
O: (p)(q) = pq
I: (q)(p) = pq
L: (q)(q) = q²
then add them all together
q²+pq+pq+q²
and combine like (identical) terms
q²+2pq+q²
it's 2pq because they're being added, not multiplied.
hope this helps!