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If the number is n, and the product is of the numbers p and q, the expression is p*q + (n + 15) : the parentheses are not necessary.
product of 3 x 15
p2 = 2p + 15 p2 - 2p - 15 = 0 (p - 5)*(p + 3) = 0 so p - 5 = 0 or p + 3 = 0 so p = 5 or p = -3
15
7p + 3