pls answer and explain it
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a
2
+b
2
+c
2
(a+b+c)
2
−2(ab+bc+ca)
(27
29
)
2
−2(2c×
2
3
c+
2
3
c×c+c×2c)
729×29−2(3c
2
+
2
3
c
2
+2c
2
)
729×29−2×
2
13c
2
729×29−13×(6
29
)
2
=
29(729−468)
=
29×261
=
29×29×9
29×3=87
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