Question

The sum of two numbers is 18.The sum of their reciprocals is 4/21, find the numbers?​

Answer 1

Step-by-step explanation:

let a number is X

then another one is=x-18

so,

1/x-1/x-18=4/21

or,x-18-x / x²-18x=4/21

or,-18*21=4(x²-18x)

or,-189=2x²-36x

or,2x²-36x+189=0