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german
2 years ago
10

If x²+y²=20 and x-y=6 how is x.y? ​

Mathematics
2 answers:
allsm [11]2 years ago
7 0

(x-y)^2=x^2-2xy+y^2

Therefore

6^2=20-2xy\\36=20-2xy\\2xy=-16\\xy=-8

tekilochka [14]2 years ago
6 0

Answer:

xy = - 8

Step-by-step explanation:

note that

(x - y)² = x² + y² - 2xy , that is

6² = 20 - 2xy

36 = 20 - 2xy ( subtract 20 from both sides )

16 = - 2xy ( divide both sides by - 2 )

- 8 = xy

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3 years ago
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3 years ago
Simplify by using the law of indices:<br>y^a(b+c)×y^b(c-a)×y^c(a-b)​
tia_tia [17]

Answer:

y^{2ac}

Step-by-step explanation:

Using the law if indices

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3 years ago
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just olya [345]

Answer:

57.06 unit^2

Step-by-step explanation:

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4 years ago
Read 2 more answers
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sertanlavr [38]

Answer:

b = 9 inches

Step-by-step explanation:

Given that,

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3 years ago
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