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September 18, 2014

September 18, 2014

Posted by **tommy** on Thursday, October 3, 2013 at 11:00pm.

find the root(values of x when the expression is equal to zero)

3x^2+21x=0

- algebra -
**Steve**, Friday, October 4, 2013 at 5:42am3x^2+21x = 0

3x(x+7) = 0

if the product of factors is zero, then one of the factors must be zero. So, when is any of the factors zero?

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