Question

If a+b=12 and ab=27,then the value of a cube +b cube is​

Answer 1

Answer:

a³ + b³ = 756

Step-by-step explanation:

a = 27/b

27/b + b = 12

b² + 12b + 27 = 0

(b-3)(b-9) = 0

b = 3 , 9

if b = 3 a = 9

if b = 9 a = 3

a³ + b³ = 27 + 729

Answer 2

Answer: a³+b³=756

Step-by-step explanation:

(a+b)³=a³+b³+3ab(a+b)-----------equation 1

so by given, we get (a+b)=12 and ab=27

let's replace the value in equation 1

(12)³=a³+b³+3×27(12)

1728=a³+b³+972

1728-972=a³+b³

a³+b³=756