If p(a|b) = 0.40 and p(b) = 0.30, find p(a ∩ b). 171 .525 .571 .120

P(A|B)=P(A ∩ B)/P(B)   (by definition of conditional probability)
=>
P(A ∩ B) = P(A|B) * P(B)
=0.40*0.30
=0.120

It looks like they've done the multiplication for you and added in the correct +/- signs). Just copy the numbers in the row above into the blanks

example, First two rows

 16a^5 + 4a^3 - 4a^2 + 3a - 1
 16a^5 + 4a^3 +  0   + 0  + 0 - 8a^4
-16a^5 - 4a^3 + 0    + 0  + 0 + 8a^4

                    8a^4 - 4a^2 + 3a - 1