Question

multiply:-
$(i) \: (a + 7) \: and \: (b - 5) \\ (ii) \: (a {}^{2} + 2b {}^{2} ) \: and \: (5a - 3b)$
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Answer 1

Answer:

Answer-1

$(a + 7) \times (b - 5) = a \times (b - 5) + 7 \times (b - 5) \\ = ab \: - 5a + 7b - 35$

Answer-2

Note that there are no like terms involved in this multiplication.

(a²+2b²) (5a-3b)

=a²(5a-3b) +2b²(5a-3b)

=5a³-3a²b+10ab²-6b³

Answer 2

Answer-1

(a+7)×(b−5)=a×(b−5)+7×(b−5)

=ab−5a+7b−35

Answer-2

(a²+2b²) (5a-3b)

=a²(5a-3b) +2b²(5a-3b)

=5a³-3a²b+10ab²-6b³