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Multiplication of Negative Numbers

Find the prod...

Question

Find the product:-
( y+7y ) ( 3+x)

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Solution

( y+7y ) ( 3+x)
y(3 + x) + 7y (3 + x)
3y + xy + 21 y+ 7 xy
24 y + 8 xy
8y(3 + x)

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