Question

x+y=7,xy=12findx3+y3

Answer 1

x=3,4
y=3,4
so,ans will be 21

Answer 2

given:
xy=12 =, y=12/x
x+y=7, x+12/x=7, 12x=7, x=7/12

y=12/x=12/(7/12)=144/7=20.57

to find:
x3+y3=3(7/12)+3(20.57)=21/36+61.71=3.5+61.71=65.21