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Foundations
medium
0:00.0
If
x
−
y
=
3
x - y = 3
x
−
y
=
3
and
x
y
=
10
xy = 10
x
y
=
10
, find
x
2
+
y
2
x^2 + y^2
x
2
+
y
2
.
A
29
B
9
C
39
D
19
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