Hi

Let x represent those numbers

Question states***

 (x+2)(x-5)= 18

 x^2 -3x-10 = 18

 x^2-3x-28 = 0

factoring

(x-7)(x+4) = 0  Note:SUM of the outside terms(4x) and the inside terms(-7x) = -3x

(x-7) = 0  x = 7

(x+4) = 0  x = -4

CHECKING our Answers***

 9*2 = 18

-2*-9  = 18 

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