Question

the sum of two natural number is 8 and their products is 15 if find the number

Answer 1

let the numbers be x nd y then
x + y = 8 and xy = 15
substituting,
x(8-x) = 15
x^2 - 8x +15 =0
(x-5)(x-3) = 0
Hence the numbers are 5 , 3