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boyakko [2]
3 years ago
15

If x-y=9,x²+y²=27,then xy=?​

Mathematics
1 answer:
Tresset [83]3 years ago
5 0

Answer:

xy = - 27

Step-by-step explanation:

Note that

(x - y)² = x² - 2xy + y² ← substitute given values, that is

9² = 27 - 2xy

81 = 27 - 2xy ( subtract 27 from both sides )

54 = - 2xy (divide both sides by - 2 )

- 27 = xy

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How can -6.75 + (10.25) be expressed as the sum of its integer and decimal parts
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Answer:

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Step-by-step explanation:

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Now, -6.75  = (-6)  +  (-0.75)

Also, (10.25)  = (10)  + (0.25)

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or,   -6.75 + (10.25)    =  ( (-6)  + (10))  + ( (-0.75) + (0.25))

Where the integer part is    ( (-6)  + (10))

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