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2 years ago

5

HELP HELP I HAVE 5 MINUTES HELP

2 answers:

Slav-nsk [51]2 years ago

6 0

Answer:

D. 5

Step-by-step explanation:

Lorico [155]2 years ago

5 0

Answer: 5

Step-by-step explanation: α²+b²=c², (a)²+(12)²= (13)²,a²+ 144 = 169,a²=169-144,a²=25,√a²=√25,a=5

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If 3x - 2y = 9 , 27x³- 8y³= 1377 , prove that xy = 4 <br><br><br><br>plzz answer this question...

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Step-by-step explanation:

Here we are given that , the Value of

$3x - 2y = 9$
$27x^3 - 8y^3 = 1377$

And we need to find the prove that ,

$xy = 4$

We know a identity as ,

$(a-b)^3 = a^3-b^3-3ab(a-b)$

On cubing both sides of the given equation,

$(3x-2y)^3 = 9^3$

Simplify and then substitute ,

$27x^3-8y^3 -3(3x)(2y)(3x-2y ) = 729$

$1377 - 18xy (9) = 729$

$162xy = 1377-729$

$xy =\dfrac{648}{162}$

$xy = 4$

Hence Proved !

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