factors

[stargil2989]

If (x-3) and (x-7) are the factors of the trinomial x^2+ax-21, what is the valve of a?

 

[pka]

If (x-3) and (x-7) are the factors then then 3 & 7 are roots!
That is 3 & 7 are zeros.

 

[stapel]

If (x-3) and (x-7) are the factors of the trinomial x^2+ax-21, what is the valve of a?

If they're factors, then they multiply together to give the quadratic. What did you find when you multiplied them together?

Eliz.

P.S. Please post any further algebra questions to one of the "algebra" categories. Thank you.