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3 years ago

5

Multiply factor 8(x-3y)(x+3y) to determine the original polynomial

2 answers:

Inessa [10]3 years ago

4 0

If I'm doing this correctly, you would need to multiply everything inside the parenthesis by 8. So it would be 8x-24y·8x+24y. I'm sorry if that's not right, but that is my interpretation of the problem. Hope I was of some assistance :)

Goryan [66]3 years ago

3 0

Let a = 8(x - 3y)(x + 3y)

by multiplying the functions in the bracket first
⇒ a = 8[ x² + 3xy - 3xy - 9y²]
a = 8 [x² - 9y²]

by now expanding the brackets
⇒ a = 8x² - 72y²

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Step-by-step explanation:

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An inlet pipe on a swimming pool can be used to fill the pool in 2020 hours. The drain pipe can be used to empty the pool in 212

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If the pool is 2/3 filled and then the inlet pipe and drain pipe are opened, it will take 140 hours to fill the pool

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A drain pipe can empty the pool in 21 hours

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Inlet pipe and drain pipe 1 hour together work = $\frac{1}{20}-\frac{1}{21}=\frac{1}{420}$

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