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soldi70 [24.7K]
2 years ago
7

If x + y = 12 and xy = -5, calculate the value of 1/x + 1/y.​

Mathematics
1 answer:
Paul [167]2 years ago
8 0

\dfrac{1}{x}+\dfrac{1}{y}=\dfrac{y}{xy}+\dfrac{x}{xy}=\dfrac{x+y}{xy}=\dfrac{12}{-5}=-\dfrac{12}{5}=-2,4

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Answer:

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Step-by-step explanation:

We can pick first the 4 man, and then the 4 women. The configuration of men and women are independant with each other, so the total of possibilities is obtained by multiplying the total possibilities to pick 4 men and the total possibilities of picking 4 women.

To pick 4 men from a group of 8, the total number of possibilities is the amount of ways to pick 4 elements from a group of 8. This number is represented by the combinatorial number of 8 with 4

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Tems11 [23]

Answer:

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Step-by-step explanation:

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