Question 317554
A quadratic equation with roots {{{a}}} and {{{b}}} can take the form of,
{{{y=(x-a)(x-b)}}}.
In your example,
{{{y=(x-(-9))(x-(-7))=(x+9)(x+7)}}}
Similarly, 
{{{x=1}}} and {{{x=0}}} are roots for
{{{y=x(x-1)}}}