16/q or 16*q^-1
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q + p
2q ÷ q = 2
Call the numbers p and q. From the problem statement, p - q = 16 and p + q = 58. From the first of these, p = q + 16. Substitute this in the second to result in q + 16 + q = 58, or 2q = 58 - 16, or q = 21, and p = 37. Alternatively 58 - 16 = 42. 42/2 = 21 and 21 + 16 = 37. Same result, different method.
2
By factoring. q2 + 16q = 0 q (q + 16) = 0 Now, either q = 0, or q + 16 = 0. Solve those two equations to get the solution.