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Byju's Answer
Standard VII
Mathematics
Addition of Algebraic Expressions
Multiply:4 m2...
Question
Multiply:
(4) (m
2
− 3mn + n
2
) (5mn + 4)
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Solution
(m
2
− 3mn + n
2
) (5mn + 4)
= (m
2
− 3mn + n
2
)5mn + (m
2
− 3mn + n
2
)4
= (m
2
× 5mn) − (3mn × 5mn) + (n
2
× 5mn) + (m
2
× 4) − (3mn × 4) + (n
2
× 4)
= 5m
3
n − 15m
2
n
2
+ 5mn
3
+ 4m
2
− 12mn + 4n
2
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