260,830 views
30 votes
30 votes
Twice the sum of a number and its reciprocal is 4. Find the number.​

User Redbull
by
2.6k points

2 Answers

19 votes
19 votes

the answer is 8

Explanation:

User Tushar Acharekar
by
3.1k points
7 votes
7 votes

Answer:

5 and negative 1?

Explanation:

x+(1/x) = 4(x-(1/x)

The rest is just algebra.

x+(1/x) = 4(x-(1/x)

x + 1/x = 4 - 4/x

x + 5/x - 4 = 0

Multiplying both sides, we have:

x^2 - 4x + 5. = 0

Factoring:

(x+1) (x-5) = 0

Two solutions: 5 and -1.

User Bneely
by
2.3k points
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