16 pints to gallons equals 2 gallons.
You would expand becausee it isn't equal to anything
(x+3)^3=(x+3)(x+3)(x+3)
we can use binomial theorem or pascal's triangle
anyway, pascal's triangle is more practicl for this one
so
for the 3rd power

a=x
b=3

=
10³ would be the correct answer because 10×10×10 would equal 1,000