Question

If x+y=12 and xy = 27 then the value of
${x3 + y3}^{?}$

10/756. (b) 765
(c) 567
(d) 576​

Answer 1

Answer:

3 and 9

Step-by-step explanation:

${3}^{3} + {9}^{3}$

$(3 \times 3 \times 3) + (9 \times 9 \times 9)$

$27 + 963$

$990$

Answer 2

a³+b³ = (a+b)³-3ab(a+b)

Therefore,

x³+b³

= (x+y)³-3xy(x+y)

= (12)³-3(27)(12)

= 1728 - 972

= 756

option a.