Zero's are defined as places where a function crosses the y-intercept. Surprisingly, we don't need to do any calculations; since we already have the zero's, we can write our equation in the factored form of (x-3)(x-7). This is because when putting a 3 or 7 as x for one of the parts of the polynomial, it will equal zero. Expand this equation to get [tex] x^{2} -10x+21[/tex]
[tex] x^{2} -10x+21[/tex] or (x-3)(x-7).
:)
