if (6m-³ + 4 n²) when m= 2 and n= 2
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Answer:
(6m−n)(36m
2
+6mn+n
2
)−(3m+2n)
2
=(6m−n)[(6m)
2
+6m×n+(n)
2
]−(3m+2n)
3
=[(6m)
3
−n
3
]−[(3m)
3
+(2n)
3
+3×3m×2n(3m+2n)]
=(216m
3
−n
3
)−(27m
3
+8n
3
+54m
2
n+36mn
2
)
=216m
3
−n
3
−27m
3
−8n
3
−54m
2
n−36mn
2
=189m
3
−9n
3
−54m
2
n−36mn
2
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