222k views
2 votes
The sum of the reciprocals of two consecutive integers is -7/12. What are the two integers?

User Artwl
by
8.6k points

1 Answer

0 votes

Final answer:

To find the two consecutive integers, you can assume that the smaller integer is x, and the larger integer is x + 1. The sum of their reciprocals can be expressed as an equation, which can be solved using algebraic methods. The two integers in this case are -1 and -3.

Step-by-step explanation:

To find the two consecutive integers, we can assume that the smaller integer is x, and the larger integer is x + 1. The reciprocal of a number is 1 divided by the number. So, the sum of their reciprocals is:

1/x + 1/(x + 1) = -7/12

To solve this equation, we can first find a common denominator:

(x + 1)/x(x + 1) + x/x(x + 1) = -7/12

Next, we can combine the fractions:

(2x + 1)/(x(x + 1)) = -7/12

To get rid of the denominators, we can cross-multiply:

12(2x + 1) = -7(x(x + 1))

Expanding and simplifying:

24x + 12 = -7x^2 - 7x

Arranging the equation in quadratic form:

7x^2 + 31x + 12 = 0

Using the quadratic formula:

x = (-31 ± sqrt(31^2 - 4 * 7 * 12)) / (2 * 7)

Simplifying further:

x = (-31 ± sqrt(961 - 336)) / 14

x = (-31 ± sqrt(625)) / 14

x = (-31 ± 25) / 14

This gives us two possible values for x:

x = (-31 + 25) / 14 = -1/2

x = (-31 - 25) / 14 = -3

So, the two consecutive integers are -1 and -3.

User Nasser Tahani
by
7.8k points