# I know that if he product of two numbers is zero, then at least one of them must be zero. ab=0

I know that if he product of two numbers is zero, then at least one of them must be zero.
ab=0
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Lillianna Mendoza
There are two possibilities,either a = 0 or a does not = 0. If a = 0 we are done. If a does not = 0 then
we may divide both sides of ab = 0 ba:
$\frac{ab}{a}=\frac{0}{a}$
which gives b=0.
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