if x - y = 2 and xy = 15, find x2 + y2 and x3 - y3.
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Answered by
2
Answer:
given : x - y = 2, xy=15
(x - y)2 = x2 + y2 - 2xy
22 = x 2 + y2 - 2*15
4 = x2 + y2 - 30
4+30= x2 + y2
x2 + y2=34
so x2 + y2 = 34
(x - y)3 = x3 - y3 -3xy (x - y)
23 = x3 - y3 -3*15(2)
8 = x3 - y3 - 45 * 2
8 = x3 - y3 - 90
8+90= x3 - y3
98 = x3 - y3
x3 - y3 = 98
Hope it helps...
Answered by
0
Answer:
Step-by-step explanation:
lets take x =3
y =5
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