If x3 + y3 = 1339
x + y = 13
Find the value of xy.
Answer & explanation
Correct answer: option 2
x3 + y3 = 1339
x + y = 13
(x + y)3 = x3 + y3 + 3xy (x + y)
2197 = 1339 + 39xy
xy = \(\frac{858}{39}\)
xy = 22
If x3 + y3 = 1339
x + y = 13
Find the value of xy.
Correct answer: option 2
x3 + y3 = 1339
x + y = 13
(x + y)3 = x3 + y3 + 3xy (x + y)
2197 = 1339 + 39xy
xy = \(\frac{858}{39}\)
xy = 22