Question

If x - y = 5 and xy = 84, find the value of 8x^3 + 27y^3.

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Answer 1

$8 {x}^{3} + 27 {y}^{3} \\ = {2x}^{3} + {3y}^{3} \\ \\ {x}^{3} + {y}^{3} = (x + y)( {x}^{2} + {y}^{2} - xy) \\ \\ = (2x + 3y)(4 {x}^{2} + 9 {y}^{2} - 6xy)$

I think x+y = 5 or it should be 8x³-27y³

Plz recheck and ask the question again.

Hope this answer helps plz mark as brainliest.

Answer 2

Answer:

8x

3

+27y

3

=2x

3

+3y

3

x

3

+y

3

=(x+y)(x

2

+y

2

−xy)

=(2x+3y)(4x

2

+9y

2

−6xy)

I think x+y = 5 or it should be 8x³-27y³

Plz recheck and ask the question again.

Hope this answer helps plz mark as brainliest.