Carol H. answered 10/24/18
Experienced Mathematics Tutor w/ Master's Degree in Math
Let x = the smaller number
Let 2x + 3 = the larger number
x^2 + 2x + 3 = 51
x^2 + 2x - 48 = 0
(x - 6)(x + 8) = 0
x - 6 = 0 or x + 8 = 0
x = 6 or x = -8, not a positive number
2x + 3 = 15