Question

If 3x - 4y = 5 and xy = 3, find :
$27x {?}^{2}$
- 64y3.​

Answer 1

Answer:

3x−4y=5

Cubing both sides,

(3x−4y)  

3

=5  

3

Step-by-step explanation:

Applying the formula,(a−b)  

3

=a  

3

−b  

3

−3ab(a−b)

(3x)  

3

−(4y)  

3

−3×3x×4y×(3x−4y))=125

(3x)  

3

−(4y)  

3

−36×xy×(3x−4y)=125

Substituting, 3x−4y=5;xy=3

27x  

3

−64y  

3

−36×3×5=125

27x  

3

−64y  

3

=125+540=665

Answer 2

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Mark this as brainliest
Also answer is 30/13