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Foundations
medium
0:00.0
If
a
2
−
b
2
=
45
a^2 - b^2 = 45
a
2
−
b
2
=
45
and
a
−
b
=
5
a - b = 5
a
−
b
=
5
, find
a
+
b
a + b
a
+
b
.
A
9
B
40
C
50
D
4
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