Answer :

apologiabiology
we remember that the distributive propert is a(b+c)=ab+ac

2 ways we can do this is to write 49 as either 40+9 or 50-1

if we do 40+9
7(49)=7(40+9)=7(40)+7(9)=280+63=343

if we do 50-1
7(49)=7(50-1)=7(50)+7(-1)=350-7=343

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