If x3 + y3 = 189
x + y = 9
Find the value of xy.
Answer & explanation
Correct answer: option 1
x3 + y3 = 189
x + y = 9
(x + y)3 = x3 + y3 + 3xy (x + y)
729 = 189 + 27xy
xy = \(\frac{540}{27}\)
xy = 20
If x3 + y3 = 189
x + y = 9
Find the value of xy.
Correct answer: option 1
x3 + y3 = 189
x + y = 9
(x + y)3 = x3 + y3 + 3xy (x + y)
729 = 189 + 27xy
xy = \(\frac{540}{27}\)
xy = 20