Question

If x+2y = 8 , xy = 8
find the value of x^3 +8y^3​

Answer 1

Step-by-step explanation:

x+2y = 8

(x+2y)³=512

x³+8y³+6xy(x+2y)=512

x³+8y³=512-6xy(x+2y)=512-6(8)(8)

x³+8y³=128