If x + y = a and xy = b, then the value of 1/x³+1/y³ is ?
Answers
Answered by
0
Answer:
+
y
3
1
=
x
3
y
3
x
3
+y
3
=
(xy)
3
(x+y)
3
−3xy(x+y)
=
b
3
a
3
−3ba
=
b
3
a
3
−3ab
Answered by
2
Answer:
(a³-3ab)/b³
Step-by-step explanation:
1/x³+1/y³=(x³+y³)/x³y³
(x³+y³)=(x+y)³-3xy(x+y)=a³-3ab
x³y³=(xy)³=b³
now apply these on the first line equation
1/x³+1/y³=(a³-3ab)/b³
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