the product of the squares of two positive integers is 81 . how many pairs of positive integers satisfy this condition ?
"ans : c - 2 pairs ( x ˆ 2 ) ( y ˆ 2 ) = 81 [ square root both sides ] xy = 9 9 = 1 x 9 , 9 x 1 , 3 x 3 cancel the repeats this leaves us with exactly 2 options . hence , c"
subtract(add(const_2, const_3), const_2)