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Question #171064
(p+q)²-2(p+q)+1
Expert's answer
(
p
+
q
)
2
−
2
(
p
+
q
)
+
1
=
(
p
+
q
−
1
)
2
(p+q)^2-2(p+q)+1=(p+q-1)^2
(
p
+
q
)
2
−
2
(
p
+
q
)
+
1
=
(
p
+
q
−
1
)
2
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