Question

x³+y³+12xy=64 . Find x+y?

Answer 1

in these question

we just take pair and we get 64

so, ( 2 +2)^3 = (4)^3

(4)^3= 64

now, x^3+y^3+12 xy =

let put the value of:

x=2

y=2

(2)^3+(2)^3 + 12 ×2×2 =64

8+8+12×4=64

16+ 48 =64

64=64