if x+ y = 10 and xy = 21 find x × x × x + y × y ×y
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Answered by
2
x3+y3
(x+y)3 - 3xy(x+y)
(10)3- 3*21*10
1000-630
370
(x+y)3 - 3xy(x+y)
(10)3- 3*21*10
1000-630
370
Janujony:
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Answered by
1
factors of 21:1,3,7,21
so x and y are either 7 or 3
as there are both 3 calculation be be simpler
3x+3y
27 * 343
=370
so x and y are either 7 or 3
as there are both 3 calculation be be simpler
3x+3y
27 * 343
=370
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