Question

if X+y=7 and XY=12 find x³ + y³
​

Answer 1

Answer:

Given that, x+y=12 and xy=27

We know,

(x+y)

3

=x

3

+y

3

+3xy(x+y)

Therefore,

12

3

=x

3

+y

3

+3×27×12

1728=x

3

+y

3

+972

x

3

+y

3

=1728−972=756

∴x

3

+y

3

=756

Answer 2

Step-by-step explanation:

3+4=7 and 3×4=12,

so, x= 3 and y=4.

x^3+y^3

= 3^3 +4^3

= 27+ 64= 91.

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